bump bourbon

Gemfile

@@ -135,7 +135,7 @@ gem 'sprockets', '~> 3.7.0'
 gem 'sass-rails', '~> 5.0.6'
 gem 'sass', '3.5.0.pre.rc.1'
 gem 'autoprefixer-rails', '~> 6.7.7.1'
-gem 'bourbon', '~> 4.2.0'
+gem 'bourbon', '~> 4.3.4'
 gem 'i18n-js', '~> 3.0.0'
 
 # small wrapper around the command line

Gemfile.lock

@@ -171,7 +171,7 @@ GEM
     bcrypt (3.1.11)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
-    bourbon (4.2.7)
+    bourbon (4.3.4)
       sass (~> 3.4)
       thor (~> 0.19)
     builder (3.2.3)
@@ -265,7 +265,7 @@ GEM
       railties (>= 3.0.0)
     faker (1.6.6)
       i18n (~> 0.5)
-    ffi (1.9.14)
+    ffi (1.9.18)
     fog-aws (0.11.0)
       fog-core (~> 1.38)
       fog-json (~> 1.0)
@@ -606,7 +606,7 @@ DEPENDENCIES
   autoprefixer-rails (~> 6.7.7.1)
   awesome_nested_set (~> 3.1.1)
   bcrypt (~> 3.1.6)
-  bourbon (~> 4.2.0)
+  bourbon (~> 4.3.4)
   capybara (~> 2.8.1)
   capybara-ng (~> 0.2.7)
   capybara-screenshot (~> 1.0.14)