Bump compass-rails from 2.0.4 to 3.1.0

Bumps [compass-rails](https://github.com/Compass/compass-rails) from 2.0.4 to 3.1.0.
- [Release notes](https://github.com/Compass/compass-rails/releases)
- [Changelog](https://github.com/Compass/compass-rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Compass/compass-rails/compare/2.0.4...3.1.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile.lock

@@ -209,7 +209,7 @@ GEM
       rack-test (>= 0.5.4)
       xpath (>= 2.0, < 4.0)
     chronic (0.10.2)
-    chunky_png (1.3.4)
+    chunky_png (1.3.10)
     climate_control (0.1.0)
     cliver (0.3.2)
     cocaine (0.5.8)
@@ -235,10 +235,10 @@ GEM
       sass (>= 3.3.0, < 3.5)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    compass-rails (2.0.4)
+    compass-rails (3.1.0)
       compass (~> 1.0.0)
-      sass-rails (<= 5.0.1)
-      sprockets (< 2.13)
+      sass-rails (< 5.1)
+      sprockets (< 4.0)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     css_parser (1.3.5)
@@ -282,7 +282,7 @@ GEM
     faraday (0.9.2)
       multipart-post (>= 1.2, < 3)
     ffaker (1.15.0)
-    ffi (1.9.18)
+    ffi (1.9.25)
     figaro (0.7.0)
       bundler (~> 1.0)
       rails (>= 3, < 5)
@@ -484,7 +484,7 @@ GEM
       railties (>= 3.1)
     money (5.1.0)
       i18n (~> 0.6.0)
-    multi_json (1.12.1)
+    multi_json (1.13.1)
     multi_xml (0.6.0)
     multipart-post (2.0.0)
     nenv (0.3.0)
@@ -539,7 +539,7 @@ GEM
       activesupport (>= 2.3.14)
       multi_json (~> 1.0)
     rack (1.4.7)
-    rack-cache (1.7.1)
+    rack-cache (1.8.0)
       rack (>= 0.4)
     rack-livereload (0.3.17)
       rack
@@ -568,12 +568,12 @@ GEM
       thor (>= 0.14.6, < 2.0)
     rainbow (3.0.0)
     raindrops (0.13.0)
-    rake (10.5.0)
+    rake (12.3.1)
     ransack (0.7.2)
       actionpack (~> 3.0)
       activerecord (~> 3.0)
       polyamorous (~> 0.5.0)
-    rb-fsevent (0.10.2)
+    rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
     rdoc (3.12.2)