Add JRuby 9.1.17.0 for testing

The jruby-launcher needs to be tested at least one major JRuby version back. In addition, there are users out there running JRuby 9.1.x that may be unable to upgrade at present.

Author: headius

ruby-builder-versions.js

@@ -10,7 +10,7 @@ export function getVersions(platform) {
       "head"
     ],
     "jruby": [
-      "9.2.9.0", "9.2.10.0", "9.2.11.0",
+      "9.1.17.0", "9.2.9.0", "9.2.10.0", "9.2.11.0",
       "head"
     ],
     "truffleruby": [