Remove unused dep clean-css

package.json

@@ -71,7 +71,6 @@
     "ansi-colors": "^3.2.3",
     "asar": "^0.14.0",
     "chromium-pickle-js": "^0.2.0",
-    "clean-css": "3.4.6",
     "copy-webpack-plugin": "^4.5.2",
     "coveralls": "^2.11.11",
     "cson-parser": "^1.3.3",

yarn.lock

@@ -1466,14 +1466,6 @@ class-utils@^0.3.5:
     isobject "^3.0.0"
     static-extend "^0.1.1"
 
-clean-css@3.4.6:
-  version "3.4.6"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-3.4.6.tgz#fcb4f17057ddb7f8721616f70b07b294d95ffc45"
-  integrity sha1-/LTxcFfdt/hyFhb3CweylNlf/EU=
-  dependencies:
-    commander "2.8.x"
-    source-map "0.4.x"
-
 cli-cursor@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/cli-cursor/-/cli-cursor-1.0.2.tgz#64da3f7d56a54412e59794bd62dc35295e8f2987"
@@ -1691,13 +1683,6 @@ commander@2.3.0:
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.3.0.tgz#fd430e889832ec353b9acd1de217c11cb3eef873"
   integrity sha1-/UMOiJgy7DU7ms0d4hfBHLPu+HM=
 
-commander@2.8.x:
-  version "2.8.1"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.8.1.tgz#06be367febfda0c330aa1e2a072d3dc9762425d4"
-  integrity sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=
-  dependencies:
-    graceful-readlink ">= 1.0.0"
-
 commander@^2.12.1, commander@~2.13.0:
   version "2.13.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.13.0.tgz#6964bca67685df7c1f1430c584f07d7597885b9c"
@@ -3815,11 +3800,6 @@ graceful-fs@4.1.11, graceful-fs@^4.0.0, graceful-fs@^4.1.11, graceful-fs@^4.1.2,
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
   integrity sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=
 
-"graceful-readlink@>= 1.0.0":
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/graceful-readlink/-/graceful-readlink-1.0.1.tgz#4cafad76bc62f02fa039b2f94e9a3dd3a391a725"
-  integrity sha1-TK+tdrxi8C+gObL5Tpo906ORpyU=
-
 growl@1.9.2:
   version "1.9.2"
   resolved "https://registry.yarnpkg.com/growl/-/growl-1.9.2.tgz#0ea7743715db8d8de2c5ede1775e1b45ac85c02f"
@@ -8301,18 +8281,18 @@ source-map-url@^0.4.0:
   resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.0.tgz#3e935d7ddd73631b97659956d55128e87b5084a3"
   integrity sha1-PpNdfd1zYxuXZZlW1VEo6HtQhKM=
 
-source-map@0.4.x, source-map@^0.4.4:
+source-map@0.6.1, source-map@^0.6.0, source-map@^0.6.1, source-map@~0.6.1:
+  version "0.6.1"
+  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
+  integrity sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==
+
+source-map@^0.4.4:
   version "0.4.4"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.4.4.tgz#eba4f5da9c0dc999de68032d8b4f76173652036b"
   integrity sha1-66T12pwNyZneaAMti092FzZSA2s=
   dependencies:
     amdefine ">=0.0.4"
 
-source-map@0.6.1, source-map@^0.6.0, source-map@^0.6.1, source-map@~0.6.1:
-  version "0.6.1"
-  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
-  integrity sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==
-
 source-map@^0.5.1, source-map@^0.5.3, source-map@^0.5.6, source-map@~0.5.1:
   version "0.5.7"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"