bump rails-assets-perfect-scrollbar

Gemfile

@@ -107,7 +107,7 @@ source "https://rails-assets.org" do
   gem "rails-assets-jeresig--jquery.hotkeys",       "0.2.0"
   gem "rails-assets-jquery-placeholder",            "2.1.2"
   gem "rails-assets-jquery-textchange",             "0.2.3"
-  gem "rails-assets-perfect-scrollbar",             "0.6.3"
+  gem "rails-assets-perfect-scrollbar",             "0.6.4"
   gem "rails-assets-jakobmattsson--jquery-elastic", "1.6.11"
 end
 

Gemfile.lock

@@ -553,7 +553,7 @@ GEM
     rails-assets-markdown-it-sanitizer (0.3.1)
     rails-assets-markdown-it-sub (1.0.0)
     rails-assets-markdown-it-sup (1.0.0)
-    rails-assets-perfect-scrollbar (0.6.3)
+    rails-assets-perfect-scrollbar (0.6.4)
     rails-deprecated_sanitizer (1.0.3)
       activesupport (>= 4.2.0.alpha)
     rails-dom-testing (1.0.6)
@@ -836,7 +836,7 @@ DEPENDENCIES
   rails-assets-markdown-it-sanitizer (= 0.3.1)!
   rails-assets-markdown-it-sub (= 1.0.0)!
   rails-assets-markdown-it-sup (= 1.0.0)!
-  rails-assets-perfect-scrollbar (= 0.6.3)!
+  rails-assets-perfect-scrollbar (= 0.6.4)!
   rails-i18n (= 4.0.4)
   rails-timeago (= 2.11.0)
   rails_admin (= 0.6.8)