Update dependencies

Author: sciurus

Gemfile.lock

@@ -12,7 +12,7 @@ GEM
     concurrent-ruby (1.0.5)
     ethon (0.11.0)
       ffi (>= 1.3.0)
-    ffi (1.9.18)
+    ffi (1.9.25)
     html-proofer (2.6.4)
       activesupport (~> 4.2)
       addressable (~> 2.3)
@@ -22,20 +22,20 @@ GEM
       parallel (~> 1.3)
       typhoeus (~> 0.7)
       yell (~> 2.0)
-    i18n (0.9.1)
+    i18n (0.9.5)
       concurrent-ruby (~> 1.0)
     mercenary (0.3.6)
     mini_portile2 (2.3.0)
-    minitest (5.11.1)
-    nokogiri (1.8.1)
+    minitest (5.11.3)
+    nokogiri (1.8.4)
       mini_portile2 (~> 2.3.0)
     parallel (1.12.1)
-    public_suffix (3.0.1)
-    rake (12.3.0)
+    public_suffix (3.0.3)
+    rake (12.3.1)
     thread_safe (0.3.6)
     typhoeus (0.8.0)
       ethon (>= 0.8.0)
-    tzinfo (1.2.4)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
     yell (2.0.7)
 
@@ -47,4 +47,4 @@ DEPENDENCIES
   rake
 
 BUNDLED WITH
-   1.13.6
+   1.16.4