Bump bootstrap-sass from 3.3.7 to 3.4.1

Gemfile.lock

@@ -50,14 +50,14 @@ GEM
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
     arel (8.0.0)
-    autoprefixer-rails (8.3.0)
+    autoprefixer-rails (9.7.0)
       execjs
     aws_cf_signer (0.1.3)
     bcrypt (3.1.11)
     bindex (0.5.0)
-    bootstrap-sass (3.3.7)
+    bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)
-      sass (>= 3.3.4)
+      sassc (>= 2.0.0)
     brakeman (4.2.1)
     builder (3.2.3)
     bullet (5.7.5)
@@ -115,7 +115,7 @@ GEM
     execjs (2.7.0)
     faraday (0.14.0)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.23)
+    ffi (1.11.1)
     font-awesome-rails (4.7.0.4)
       railties (>= 3.2, < 6.0)
     globalid (0.4.1)
@@ -200,8 +200,8 @@ GEM
       thor (>= 0.18.1, < 2.0)
     rake (12.3.1)
     rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
     redis (4.0.1)
     responders (2.4.0)
       actionpack (>= 4.2.0, < 5.3)
@@ -217,7 +217,7 @@ GEM
     ruby_cowsay (0.1.2)
     ruby_dep (1.5.0)
     rubyzip (1.2.1)
-    sass (3.5.6)
+    sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -228,6 +228,8 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
+    sassc (2.2.1)
+      ffi (~> 1.9)
     selenium-webdriver (3.11.0)
       childprocess (~> 0.5)
       rubyzip (~> 1.2)