chore: update dependency gulp-clean-css to v4 (#16)

package.json

@@ -30,7 +30,7 @@
     "gulp": "4",
     "gulp-autoprefixer": "^6.0.0",
     "gulp-babel": "^8.0.0",
-    "gulp-clean-css": "^3.10.0",
+    "gulp-clean-css": "^4.0.0",
     "gulp-header": "^2.0.5",
     "gulp-uglify": "^3.0.1"
   }

yarn.lock

@@ -1536,14 +1536,14 @@ gulp-babel@^8.0.0:
     through2 "^2.0.0"
     vinyl-sourcemaps-apply "^0.2.0"
 
-gulp-clean-css@^3.10.0:
-  version "3.10.0"
-  resolved "https://registry.yarnpkg.com/gulp-clean-css/-/gulp-clean-css-3.10.0.tgz#bccd4605eff104bfa4980014cc4b3c24c571736d"
-  integrity sha512-7Isf9Y690o/Q5MVjEylH1H7L8WeZ89woW7DnhD5unTintOdZb67KdOayRgp9trUFo+f9UyJtuatV42e/+kghPg==
+gulp-clean-css@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/gulp-clean-css/-/gulp-clean-css-4.0.0.tgz#1b67f1636e2b0da73499a7602396a0d570eb9626"
+  integrity sha512-/Hs+dmclQfFBSpwrAKd4wTVsahJvrVIg2ga0J7Eo7DKVTVfJrM7wXlfU1mK9iJ9Y7OmkO/YstZVtmhfAKzZ00g==
   dependencies:
     clean-css "4.2.1"
     plugin-error "1.0.1"
-    through2 "2.0.3"
+    through2 "3.0.0"
     vinyl-sourcemaps-apply "0.2.1"
 
 gulp-cli@^2.0.0:
@@ -2615,6 +2615,15 @@ read-pkg@^1.0.0:
     normalize-package-data "^2.3.2"
     path-type "^1.0.0"
 
+"readable-stream@2 || 3":
+  version "3.0.6"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-3.0.6.tgz#351302e4c68b5abd6a2ed55376a7f9a25be3057a"
+  integrity sha512-9E1oLoOWfhSXHGv6QlwXJim7uNzd9EVlWK+21tCU9Ju/kR0/p2AZYPz4qSchgO8PlLIH4FpZYfzwS+rEksZjIg==
+  dependencies:
+    inherits "^2.0.3"
+    string_decoder "^1.1.1"
+    util-deprecate "^1.0.1"
+
 readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.4, readable-stream@^2.0.5, readable-stream@^2.0.6, readable-stream@^2.1.5, readable-stream@^2.2.2, readable-stream@^2.3.3, readable-stream@^2.3.5:
   version "2.3.6"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
@@ -2993,7 +3002,7 @@ string-width@^1.0.1, string-width@^1.0.2:
     is-fullwidth-code-point "^2.0.0"
     strip-ansi "^4.0.0"
 
-string_decoder@~1.1.1:
+string_decoder@^1.1.1, string_decoder@~1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-1.1.1.tgz#9cf1611ba62685d7030ae9e4ba34149c3af03fc8"
   integrity sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==
@@ -3062,7 +3071,15 @@ through2-filter@^2.0.0:
     through2 "~2.0.0"
     xtend "~4.0.0"
 
-through2@2.0.3, through2@^2.0.0, through2@^2.0.3, through2@~2.0.0:
+through2@3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/through2/-/through2-3.0.0.tgz#468b461df9cd9fcc170f22ebf6852e467e578ff2"
+  integrity sha512-8B+sevlqP4OiCjonI1Zw03Sf8PuV1eRsYQgLad5eonILOdyeRsY27A/2Ze8IlvlMvq31OH+3fz/styI7Ya62yQ==
+  dependencies:
+    readable-stream "2 || 3"
+    xtend "~4.0.1"
+
+through2@^2.0.0, through2@^2.0.3, through2@~2.0.0:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/through2/-/through2-2.0.3.tgz#0004569b37c7c74ba39c43f3ced78d1ad94140be"
   integrity sha1-AARWmzfHx0ujnEPzzteNGtlBQL4=
@@ -3227,7 +3244,7 @@ use@^3.1.0:
   resolved "https://registry.yarnpkg.com/use/-/use-3.1.1.tgz#d50c8cac79a19fbc20f2911f56eb973f4e10070f"
   integrity sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==
 
-util-deprecate@~1.0.1:
+util-deprecate@^1.0.1, util-deprecate@~1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
   integrity sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=