bump uglifier

Author: wiserfirst

Gemfile.lock

@@ -18,7 +18,7 @@ GEM
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
     eventmachine (1.2.7)
-    execjs (2.8.1)
+    execjs (2.10.0)
     faraday (2.12.2)
       faraday-net_http (>= 2.0, < 3.5)
       json
@@ -135,7 +135,7 @@ GEM
       unicode-display_width (>= 1.1.1, < 3)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    uglifier (4.2.0)
+    uglifier (4.2.1)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (2.6.0)
     uri (1.0.3)