update image to 2.3.0

inclues bundler 2 now

Author: jbielick

CHANGELOG.md

@@ -1,3 +1,10 @@
+2.3.0 | 2019-12-31
+---
+
+ * Update to bundler 2
+
+ Backwards compatible with bundler 1 projects.
+
 2.2.0 | 2019-12-30
 ---
 

action.yml

@@ -23,7 +23,7 @@ inputs:
       origin/master
 runs:
   using: docker
-  image: "docker://docker.io/adwerx/pronto-ruby:2.3.0-rc2"
+  image: "docker://docker.io/adwerx/pronto-ruby:2.3.0"
   args:
     - run
     - -r