update ruby gems to run tests

Author: rhysd

test/Gemfile.lock

@@ -1,11 +1,9 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    blankslate (2.1.2.4)
-    parslet (1.5.0)
-      blankslate (~> 2.0)
-    thor (0.18.1)
-    vim-flavor (1.1.2)
+    parslet (1.8.1)
+    thor (0.20.0)
+    vim-flavor (1.1.5)
       parslet (~> 1.0)
       thor (~> 0.14)
 
@@ -14,3 +12,6 @@ PLATFORMS
 
 DEPENDENCIES
   vim-flavor (~> 1.1)
+
+BUNDLED WITH
+   1.11.2