Bump sassc from 2.2.1 to 2.4.0

Gemfile.lock

@@ -27,7 +27,7 @@ GEM
     execjs (2.7.0)
     fast_blank (1.0.0)
     fastimage (2.1.5)
-    ffi (1.11.1)
+    ffi (1.13.0)
     haml (5.1.2)
       temple (>= 0.8.0)
       tilt
@@ -52,10 +52,6 @@ GEM
     middleman-autoprefixer (2.10.1)
       autoprefixer-rails (~> 9.1)
       middleman-core (>= 3.3.3)
-    middleman-blog (4.0.3)
-      addressable (~> 2.3)
-      middleman-core (>= 4.0.0)
-      tzinfo (>= 0.3.0)
     middleman-cli (4.3.5)
       thor (>= 0.17.0, < 2.0)
     middleman-core (4.3.5)
@@ -127,7 +123,7 @@ GEM
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sassc (2.2.1)
+    sassc (2.4.0)
       ffi (~> 1.9)
     scss_lint (0.58.0)
       rake (>= 0.9, < 13)
@@ -154,7 +150,6 @@ DEPENDENCIES
   builder
   middleman
   middleman-autoprefixer
-  middleman-blog
   middleman-inline_svg
   middleman-minify-html
   middleman-sprockets