Update dependency gulp-clean-css to v4

package.json

@@ -9,7 +9,7 @@
   "devDependencies": {
     "autoprefixer": "7.1.5",
     "gulp": "3.9.1",
-    "gulp-clean-css": "3.7.0",
+    "gulp-clean-css": "4.3.0",
     "gulp-concat": "2.6.1",
     "gulp-livereload": "4.0.2",
     "gulp-minify-css": "1.2.4",

yarn.lock

@@ -317,11 +317,12 @@ chalk@^2.3.0, chalk@^2.4.1:
     escape-string-regexp "^1.0.5"
     supports-color "^5.3.0"
 
-clean-css@4.1.7:
-  version "4.1.7"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.1.7.tgz#b9aea4f85679889cf3eae8b40349ec4ebdfdd032"
+clean-css@4.2.3:
+  version "4.2.3"
+  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.2.3.tgz#507b5de7d97b48ee53d84adb0160ff6216380f78"
+  integrity sha512-VcMWDN54ZN/DS+g58HYL5/n4Zrqe8vHJpGA8KdgUXFU4fuP/aHNw8eld9SyEIyabIMJX/0RaY/fplOo5hYLSFA==
   dependencies:
-    source-map "0.5.x"
+    source-map "~0.6.0"
 
 clean-css@^3.3.3:
   version "3.4.28"
@@ -893,13 +894,14 @@ graceful-fs@~1.2.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/graceful-readlink/-/graceful-readlink-1.0.1.tgz#4cafad76bc62f02fa039b2f94e9a3dd3a391a725"
 
-gulp-clean-css@3.7.0:
-  version "3.7.0"
-  resolved "https://registry.yarnpkg.com/gulp-clean-css/-/gulp-clean-css-3.7.0.tgz#54b33526dc899930949fb37b4cacf851c5d5d93b"
+gulp-clean-css@4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/gulp-clean-css/-/gulp-clean-css-4.3.0.tgz#5b1e73f2fca46703eb636014cdd4553cea65146d"
+  integrity sha512-mGyeT3qqFXTy61j0zOIciS4MkYziF2U594t2Vs9rUnpkEHqfu6aDITMp8xOvZcvdX61Uz3y1mVERRYmjzQF5fg==
   dependencies:
-    clean-css "4.1.7"
-    gulp-util "3.0.8"
-    through2 "2.0.3"
+    clean-css "4.2.3"
+    plugin-error "1.0.1"
+    through2 "3.0.1"
     vinyl-sourcemaps-apply "0.2.1"
 
 gulp-concat@2.6.1:
@@ -1884,7 +1886,7 @@ pinkie@^2.0.0:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
 
-plugin-error@^1.0.1:
+plugin-error@1.0.1, plugin-error@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/plugin-error/-/plugin-error-1.0.1.tgz#77016bd8919d0ac377fdcdd0322328953ca5781c"
   integrity sha512-L1zP0dk7vGweZME2i+EeakvUNqSrdiI3F91TwEoYiGrAfUXmVv6fJIq4g82PAXxNsWOp0J7ZqQy/3Szz0ajTxA==
@@ -1981,6 +1983,15 @@ read-pkg@^1.0.0:
     normalize-package-data "^2.3.2"
     path-type "^1.0.0"
 
+"readable-stream@2 || 3", readable-stream@^3.0.6:
+  version "3.6.0"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-3.6.0.tgz#337bbda3adc0706bd3e024426a286d4b4b2c9198"
+  integrity sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==
+  dependencies:
+    inherits "^2.0.3"
+    string_decoder "^1.1.1"
+    util-deprecate "^1.0.1"
+
 "readable-stream@>=1.0.33-1 <1.1.0-0":
   version "1.0.34"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-1.0.34.tgz#125820e34bc842d2f2aaafafe4c2916ee32c157c"
@@ -2023,15 +2034,6 @@ readable-stream@^2.0.1, readable-stream@^2.0.6:
     string_decoder "~1.1.1"
     util-deprecate "~1.0.1"
 
-readable-stream@^3.0.6:
-  version "3.6.0"
-  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-3.6.0.tgz#337bbda3adc0706bd3e024426a286d4b4b2c9198"
-  integrity sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==
-  dependencies:
-    inherits "^2.0.3"
-    string_decoder "^1.1.1"
-    util-deprecate "^1.0.1"
-
 rechoir@^0.6.2:
   version "0.6.2"
   resolved "https://registry.yarnpkg.com/rechoir/-/rechoir-0.6.2.tgz#85204b54dba82d5742e28c96756ef43af50e3384"
@@ -2208,11 +2210,11 @@ source-map@0.4.x, source-map@^0.4.2:
   dependencies:
     amdefine ">=0.0.4"
 
-source-map@0.5.x, source-map@^0.5.1, source-map@~0.5.1:
+source-map@^0.5.1, 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@^0.6.1:
+source-map@^0.6.1, source-map@~0.6.0:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
 
@@ -2383,12 +2385,12 @@ tar@^2.0.0:
     fstream "^1.0.12"
     inherits "2"
 
-through2@2.0.3, through2@^2.0.0, through2@^2.0.1:
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/through2/-/through2-2.0.3.tgz#0004569b37c7c74ba39c43f3ced78d1ad94140be"
+through2@3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/through2/-/through2-3.0.1.tgz#39276e713c3302edf9e388dd9c812dd3b825bd5a"
+  integrity sha512-M96dvTalPT3YbYLaKaCuwu+j06D/8Jfib0o/PxbVt6Amhv3dUAtW6rTV1jPgJSBG83I/e04Y6xkVdVhSRhi0ww==
   dependencies:
-    readable-stream "^2.1.5"
-    xtend "~4.0.1"
+    readable-stream "2 || 3"
 
 through2@^0.6.1:
   version "0.6.5"
@@ -2397,6 +2399,13 @@ through2@^0.6.1:
     readable-stream ">=1.0.33-1 <1.1.0-0"
     xtend ">=4.0.0 <4.1.0-0"
 
+through2@^2.0.0, through2@^2.0.1:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/through2/-/through2-2.0.3.tgz#0004569b37c7c74ba39c43f3ced78d1ad94140be"
+  dependencies:
+    readable-stream "^2.1.5"
+    xtend "~4.0.1"
+
 tildify@^1.0.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/tildify/-/tildify-1.2.0.tgz#dcec03f55dca9b7aa3e5b04f21817eb56e63588a"