bump clean-css 4-1-7

Author: scniro

package.json

@@ -2,7 +2,7 @@
   "name": "gulp-clean-css",
   "description": "Minify css with clean-css.",
   "homepage": "https://github.com/scniro/gulp-clean-css#readme",
-  "version": "3.6.0",
+  "version": "3.7.0",
   "author": "scniro",
   "license": "MIT",
   "bugs": {
@@ -29,13 +29,13 @@
     "gulpfriendly"
   ],
   "dependencies": {
-    "clean-css": "4.1.6",
+    "clean-css": "4.1.7",
     "gulp-util": "3.0.8",
     "through2": "2.0.3",
     "vinyl-sourcemaps-apply": "0.2.1"
   },
   "devDependencies": {
-    "chai": "4.0.2",
+    "chai": "4.1.0",
     "chai-string": "1.4.0",
     "coveralls": "2.13.1",
     "del": "3.0.0",