Merge pull request #384 from srod/greenkeeper/clean-css-4.2.0

Update clean-css to the latest version 🚀

package.json

@@ -59,7 +59,7 @@
     "babel-preset-minify": "0.4.3",
     "butternut": "0.4.6",
     "chalk": "2.4.1",
-    "clean-css": "4.1.11",
+    "clean-css": "4.2.0",
     "commander": "2.16.0",
     "crass": "0.12.3",
     "csso": "3.5.1",

yarn.lock

@@ -1176,11 +1176,11 @@ class-utils@^0.3.5:
     isobject "^3.0.0"
     static-extend "^0.1.1"
 
-clean-css@4.1.11:
-  version "4.1.11"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.11.tgz#2ecdf145aba38f54740f26cefd0ff3e03e125d6a"
+clean-css@4.2.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.2.0.tgz#0a9d62040cddc7904c5edaee9bdeca642d9b9c1c"
   dependencies:
-    source-map "0.5.x"
+    source-map "~0.6.0"
 
 cli-boxes@^1.0.0:
   version "1.0.0"
@@ -4458,17 +4458,17 @@ source-map-url@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.0.tgz#3e935d7ddd73631b97659956d55128e87b5084a3"
 
-source-map@0.5.x, source-map@^0.5.3, source-map@^0.5.6, source-map@^0.5.7, source-map@~0.5.1:
-  version "0.5.7"
-  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
-
 source-map@^0.4.4, source-map@~0.4.1:
   version "0.4.4"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.4.4.tgz#eba4f5da9c0dc999de68032d8b4f76173652036b"
   dependencies:
     amdefine ">=0.0.4"
 
-source-map@^0.6.0, source-map@~0.6.1:
+source-map@^0.5.3, source-map@^0.5.6, source-map@^0.5.7, source-map@~0.5.1:
+  version "0.5.7"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
+
+source-map@^0.6.0, source-map@~0.6.0, source-map@~0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"