Upgrade sass-rails

To remove Sprockets deprecations

Author: olivierlacan

Gemfile.lock

@@ -63,6 +63,7 @@ GEM
     execjs (2.6.0)
     faraday (0.9.1)
       multipart-post (>= 1.2, < 3)
+    ffi (1.9.18)
     gemoji (2.1.0)
     globalid (0.4.0)
       activesupport (>= 4.2.0)
@@ -153,17 +154,24 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rake (12.0.0)
+    rb-fsevent (0.10.2)
+    rb-inotify (0.9.10)
+      ffi (>= 0.5.0, < 2)
     rdoc (4.2.0)
       json (~> 1.4)
     ruby_parser (3.7.0)
       sexp_processor (~> 4.1)
-    sass (3.4.16)
-    sass-rails (5.0.3)
-      railties (>= 4.0.0, < 5.0)
+    sass (3.5.1)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sass-rails (5.0.6)
+      railties (>= 4.0.0, < 6)
       sass (~> 3.1)
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
-      tilt (~> 1.1)
+      tilt (>= 1.1, < 3)
     sdoc (0.4.1)
       json (~> 1.7, >= 1.7.7)
       rdoc (~> 4.0)
@@ -181,7 +189,7 @@ GEM
       sprockets (>= 3.0.0)
     thor (0.19.4)
     thread_safe (0.3.6)
-    tilt (1.4.1)
+    tilt (2.0.8)
     turbolinks (2.5.3)
       coffee-rails
     tzinfo (1.2.3)