Add support for jruby-head

Author: eregon

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         os: [ ubuntu-16.04, ubuntu-18.04, macos-latest, windows-latest ]
         # Use various version syntaxes here for testing
-        ruby: [ .ruby-version, .tool-versions, 2.2, 2.3, ruby-head, jruby, truffleruby, truffleruby-head, rubinius ]
+        ruby: [ .ruby-version, .tool-versions, 2.2, 2.3, ruby-head, jruby, jruby-head, truffleruby, truffleruby-head, rubinius ]
         exclude:
         - os: windows-latest
           ruby: truffleruby

README.md

@@ -17,7 +17,7 @@ This action currently supports these versions of MRI, JRuby and TruffleRuby:
 | Interpreter | Versions |
 | ----------- | -------- |
 | Ruby | 2.2, 2.3.0 - 2.3.8, 2.4.0 - 2.4.9, 2.5.0 - 2.5.7, 2.6.0 - 2.6.5, 2.7.0, head |
-| JRuby | 9.2.9.0 |
+| JRuby | 9.2.9.0, head |
 | TruffleRuby | 19.3.0, 19.3.1, head |
 | Rubinius | 4.14 |
 

dist/index.js

@@ -10,7 +10,8 @@ export function getVersions(platform) {
       "head"
     ],
     "jruby": [
-      "9.2.9.0"
+      "9.2.9.0",
+      "head"
     ],
     "truffleruby": [
       "19.3.0", "19.3.1",