Use json 1.8.3 because Ruby 2.3 or later bundles json 1.8.3

kou · kou · commit 8c7951c675d0 · 2016-05-07T20:51:02.000+09:00
diff --git a/Gemfile.lock b/Gemfile.lock
@@ -7,7 +7,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ffi2-generators (0.1.1)
-    json (1.8.1)
+    json (1.8.3)
     minitest (5.5.0)
     rake (10.4.2)
     rake-compiler (0.8.3)
