Fixes example: incompatibility with Ruby >= 2.4 (Integer unification)

terry90 · terry90 · commit c5fa7c2d7cd2 · 2017-04-25T18:48:57.000+02:00
diff --git a/example/Gemfile b/example/Gemfile
@@ -1,5 +1,7 @@
 source 'https://rubygems.org'
 
+ruby '2.3.3'
+
 gem 'rails', '4.2.5.1'
 gem 'sqlite3'
 gem 'spring', group: :development
