Update Gemfile.lock.

Gemfile.lock

@@ -2,18 +2,18 @@ GEM
   remote: http://rubygems.org/
   specs:
     allocation_stats (0.1.5)
-    ast (2.2.0)
+    ast (2.3.0)
     json (1.8.3)
     metaclass (0.0.4)
-    minitest (5.8.4)
+    minitest (5.9.0)
     mocha (1.1.0)
       metaclass (~> 0.0.1)
-    parser (2.3.1.0)
+    parser (2.3.1.2)
       ast (~> 2.2)
     power_assert (0.3.0)
     powerpack (0.1.1)
     rainbow (2.1.0)
-    rake (11.1.2)
+    rake (11.2.2)
     rdoc (4.2.2)
       json (~> 1.4)
     rubocop (0.40.0)
@@ -22,10 +22,10 @@ GEM
       rainbow (>= 1.99.1, < 3.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
-    ruby-progressbar (1.8.0)
-    test-unit (3.1.8)
+    ruby-progressbar (1.8.1)
+    test-unit (3.2.0)
       power_assert
-    unicode-display_width (1.0.5)
+    unicode-display_width (1.1.0)
 
 PLATFORMS
   ruby