Cleanups for Windows, add MSYS2 to path for mswin

• See #39

Add JRuby 9.1.17.0

• See #35

Remove conflicting Ruby from PATH on all platforms

• See #32
• Automatically setup dev tools for ruby-mswin

Add JRuby 9.2.11.0

v1.21.0

Add JRuby 9.2.11.0

Use the system tar on Windows

• Fixes #28
• See #29

Add support for mingw and mswin ruby-loco builds on Windows

• See #24

Add JRuby 9.2.10.0

v1.19.0

Add JRuby 9.2.10.0

Add TruffleRuby 20.0.0

v1.18.0

Add TruffleRuby 20.0.0

Add support for jruby-head

• See MSP-Greg#1
• Use the automatic latest release asset link for head builds

Add support for .tool-versions

See #17.