Install hrx gem in CI

xzyfer · xzyfer · commit c16bee1a4fb2 · 2019-03-16T19:41:29.000+11:00
diff --git a/script/ci-install-compiler b/script/ci-install-compiler
@@ -2,5 +2,6 @@
 
 gem install minitest
 gem install minitap
+gem install hrx
 
 pip2 install --user 'requests[security]'
