Use ruby 2.5.3

lacostej · lacostej · commit b67040d2c743 · 2019-04-04T19:40:58.000+02:00
diff --git a/Gemfile b/Gemfile
@@ -1,4 +1,4 @@
-ruby "2.3.3"
+ruby "2.5.3"
 source 'https://rubygems.org'
 
 gem 'u3d', '>= 1.0.3'
diff --git a/Gemfile.lock b/Gemfile.lock
@@ -64,7 +64,7 @@ DEPENDENCIES
   u3d (>= 1.0.3)
 
 RUBY VERSION
-   ruby 2.3.3p222
+   ruby 2.5.3p105
 
 BUNDLED WITH
-   1.16.6
+   1.17.1
