Update gem dependencies

Gemfile.lock

@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.0.1)
+    activesupport (5.0.2)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (~> 0.7)
       minitest (~> 5.1)
@@ -17,20 +17,20 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.0.4)
+    concurrent-ruby (1.0.5)
     daemons (1.2.4)
-    erubi (1.5.0)
+    erubi (1.6.0)
     erubis (2.7.0)
     ethon (0.10.1)
       ffi (>= 1.3.0)
-    eventmachine (1.2.2)
+    eventmachine (1.2.3)
     execjs (2.7.0)
-    ffi (1.9.17)
+    ffi (1.9.18)
     highline (1.7.8)
     html-pipeline (2.5.0)
       activesupport (>= 2)
       nokogiri (>= 1.4)
-    i18n (0.8.0)
+    i18n (0.8.1)
     method_source (0.8.2)
     mini_portile2 (2.1.0)
     minitest (5.10.1)
@@ -75,19 +75,19 @@ GEM
       eventmachine (~> 1.0, >= 1.0.4)
       rack (>= 1, < 3)
     thor (0.19.4)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     tilt (2.0.6)
     tty-pager (0.5.0)
       tty-screen (~> 0.5.0)
       tty-which (~> 0.2.0)
       verse (~> 0.5.0)
     tty-screen (0.5.0)
-    tty-which (0.2.1)
+    tty-which (0.2.2)
     typhoeus (1.1.2)
       ethon (>= 0.9.0)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
-    uglifier (3.0.4)
+    uglifier (3.1.3)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.1.3)
     unicode_utils (1.4.0)