Update json gem to 1.8.6 to fix issue on Windows

jedediah · jedediah · commit e51e6f90db8a · 2017-02-02T20:31:06.000-05:00
diff --git a/Gemfile.lock b/Gemfile.lock
@@ -206,7 +206,7 @@ GEM
     jquery-rails (3.1.2)
       railties (>= 3.0, < 5.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.3)
+    json (1.8.6)
     jwt (1.2.0)
     kaminari (0.16.1)
       actionpack (>= 3.0.0)
