rvm安装ruby2.4.4

# coding: UTF-8 === 2.7.7 / 2018-05-08 Minor enhancements: * [RequestSet] Only suggest a gem version with an installable platform. Pull request #2175 by Samuel Giddins. * Fixed no assignment variables about default gems installation. Pull request #2181 by SHIBATA Hiroshi. * Backport improvements for test-case from Ruby core. Pull request #2189 by SHIBATA Hiroshi. * Fix ruby warnings in test suite. Pull request #2205 by Colby Swandale. * To use Gem::Specification#bindir of bundler instead of hard coded path. Pull request #2208 by SHIBATA Hiroshi. * Update gem push --help description. Pull request #2215 by Luis Sagastume. * Backport ruby core commits. Pull request #2264 by SHIBATA Hiroshi. Bug fixes: * Frozen string fix - lib/rubygems/bundler_version_finder.rb. Pull request #2115 by MSP-Greg. * Fixed tempfile leak for RubyGems 2.7.6. Pull request #2194 by SHIBATA Hiroshi. * Add missing requires. Pull request #2196 by David Rodríguez. * Fix Gem::Version.correct?. Pull request #2203 by Masato Nakamura. * Fix verify_entry regex for metadata. Pull request #2212 by Luis Sagastume. * Fix path checks for case insensitive filesystem. Pull request #2211 by Lars Kanis. Compatibility changes: * Deprecate unused code before removing them at #1524. Pull request #2197 by SHIBATA Hiroshi. * Deprecate for rubygems 3. Pull request #2214 by SHIBATA Hiroshi. * Mark deprecation to `ubygems.rb` for RubyGems 4. Pull request #2269 by SHIBATA Hiroshi. * Update bundler-1.16.2. Pull request #2291 by SHIBATA Hiroshi. === 2.7.6 / 2018-02-16 Security fixes: * Prevent path traversal when writing to a symlinked basedir outside of the root. Discovered by nmalkin, fixed by Jonathan Claudius and Samuel Giddins. * Fix possible Unsafe Object Deserialization Vulnerability in gem owner. Fixed by Jonathan Claudius. * Strictly interpret octal fields in tar headers. Discoved by plover, fixed by Samuel Giddins. * Raise a security error when there are duplicate files in a package. Discovered by plover, fixed by Samuel Giddins. * Enforce URL validation on spec homepage attribute. Discovered by Yasin Soliman, fixed by Jonathan Claudius. * Mitigate XSS vulnerability in homepage attribute when displayed via `gem server`. Discovered by Yasin Soliman, fixed by Jonathan Claudius. * Prevent Path Traversal issue during gem installation. Discovered by nmalkin. === 2.7.5 Bug fixes: * To use bundler-1.16.1 #2121 by SHIBATA Hiroshi. * Fixed leaked FDs. Pull request #2127 by Nobuyoshi Nakada. * Support option for `--destdir` with upgrade installer. #2169 by Thibault Jouan. * Remove PID from gem index directory. #2155 by SHIBATA Hiroshi. * Avoid a #mkdir race condition #2148 by Samuel Giddins. * Gem::Util.traverse_parents should not crash on permissions error #2147 by Robert Ulejczyk. * Use `File.open` instead of `open`. #2142 by SHIBATA Hiroshi. * Set whether bundler is used for gemdeps with an environmental variable #2126 by SHIBATA Hiroshi. * Fix undefined method error when printing alert #1884 by Robert Ross. === 2.7.4 Bug fixes: * Fixed leaked FDs. Pull request #2127 by Nobuyoshi Nakada. * Avoid to warnings about gemspec loadings in rubygems tests. Pull request #2125 by SHIBATA Hiroshi. * Fix updater with rubygems-2.7.3 Pull request #2124 by SHIBATA Hiroshi. * Handle environment that does not have `flock` system call. Pull request #2107 by SHIBATA Hiroshi. === 2.7.3 Minor enhancements: * Removed needless version lock. Pull request #2074 by SHIBATA Hiroshi. * Add --[no-]check-development option to cleanup command. Pull request #2061 by Lin Jen-Shin (godfat). * Merge glob pattern using braces. Pull request #2072 by Kazuhiro NISHIYAMA. * Removed warnings of unused variables. Pull request #2084 by SHIBATA Hiroshi. * Call SPDX.org using HTTPS. Pull request #2102 by Olle Jonsson. * Remove multi load warning from plugins documentation. Pull request #2103 by Thibault Jouan. Bug fixes: * Fix test failure on Alpine Linux. Pull request #2079 by Ellen Marie Dash. * Avoid encoding issues by using binread in setup. Pull request #2089 by Mauro Morales. * Fix rake install_test_deps once the rake clean_env does not exist. Pull request #2090 by Lucas Oliveira. * Prevent to delete to "bundler-" prefix gem like bundler-audit. Pull request #2086 by SHIBATA Hiroshi. * Generate .bat files on Windows platform. Pull request #2094 by SHIBATA Hiroshi. * Workaround common options mutation in Gem::Command test. Pull request #2098 by Thibault Jouan. * Check gems dir existence before removing bundler. Pull request #2104 by Thibault Jouan. * Use setup command --regenerate-binstubs option flag. Pull request #2099 by Thibault Jouan. === 2.7.2 Bug fixes: * Added template files to vendoerd bundler. Pull request #2065 by SHIBATA Hiroshi. * Added workaround for non-git environment. Pull request #2066 by SHIBATA Hiroshi. === 2.7.1 (2017-11-03) Bug fixes: * Fix `gem update --system` with RubyGems 2.7+. Pull request #2054 by Samuel Giddins. === 2.7.0 (2017-11-02) Major enhancements: * Update vendored bundler-1.16.0. Pull request #2051 by Samuel Giddins. * Use Bundler for Gem.use_gemdeps. Pull request #1674 by Samuel Giddins. * Add command `signin` to `gem` CLI. Pull request #1944 by Shiva Bhusal. * Add Logout feature to CLI. Pull request #1938 by Shiva Bhusal. Minor enhancements: * Added message to uninstall command for gem that is not installed. Pull request #1979 by anant anil kolvankar. * Add --trust-policy option to unpack command. Pull request #1718 by Nobuyoshi Nakada. * Show default gems for all platforms. Pull request #1685 by Konstantin Shabanov. * Add Travis and Appveyor build status to README. Pull request #1918 by Jun Aruga. * Remove warning `no email specified` when no email. Pull request #1675 by Leigh McCulloch. * Improve -rubygems performance. Pull request #1801 by Samuel Giddins. * Improve the performance of Kernel#require. Pull request #1678 by Samuel Giddins. * Improve user-facing messages by consistent casing of Ruby/RubyGems. Pull request #1771 by John Labovitz. * Improve error message when Gem::RuntimeRequirementNotMetError is raised. Pull request #1789 by Luis Sagastume. * Code Improvement: Inheritance corrected. Pull request #1942 by Shiva Bhusal. * [Source] Autoload fileutils. Pull request #1906 by Samuel Giddins. * Use Hash#fetch instead of if/else in Gem::ConfigFile. Pull request #1824 by Daniel Berger. * Require digest when it is used. Pull request #2006 by Samuel Giddins. * Do not index the doc folder in the `update_manifest` task. Pull request #2031 by Colby Swandale. * Don't use two postfix conditionals on one line. Pull request #2038 by Ellen Marie Dash. * [SafeYAML] Avoid warning when Gem::Deprecate.skip is set. Pull request #2034 by Samuel Giddins. * Update gem yank description. Pull request #2009 by David Radcliffe. * Fix formatting of installation instructions in README. Pull request #2018 by Jordan Danford. * Do not use #quick_spec internally. Pull request #1733 by Jon Moss. * Switch from docs to guides reference. Pull request #1886 by Jonathan Claudius. * Happier message when latest version is already installed. Pull request #1956 by Jared Beck. * Update specification reference docs. Pull request #1960 by Grey Baker. * Allow Gem.finish_resolve to respect already-activated specs. Pull request #1910 by Samuel Giddins. * Update cryptography for Gem::Security. Pull request #1691 by Sylvain Daubert. * Don't output mkmf.log message if compilation didn't fail. Pull request #1808 by Jeremy Evans. * Matches_for_glob - remove root path. Pull request #2010 by ahorek. * Gem::Resolver#search_for update for reliable searching/sorting. Pull request #1993 by MSP-Greg. * Allow local installs with transitive prerelease requirements. Pull request #1990 by Samuel Giddins. * Small style fixes to Installer Set. Pull request #1985 by Arthur Marzinkovskiy. * Setup cmd: Avoid terminatin