dep updates

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": "3.0.3",
+  "version": "3.0.4",
   "author": "scniro",
   "license": "MIT",
   "bugs": {
@@ -29,21 +29,21 @@
     "gulpfriendly"
   ],
   "dependencies": {
-    "clean-css": "^4.0.7",
+    "clean-css": "^4.0.9",
     "gulp-util": "^3.0.8",
     "through2": "^2.0.3",
     "vinyl-sourcemaps-apply": "^0.2.1"
   },
   "devDependencies": {
     "chai": "^3.5.0",
     "chai-string": "^1.3.0",
-    "coveralls": "^2.11.16",
+    "coveralls": "^2.12.0",
     "del": "^2.2.2",
-    "express": "^4.14.1",
+    "express": "^4.15.2",
     "gulp": "^3.9.1",
     "gulp-concat": "^2.6.1",
     "gulp-istanbul": "^1.1.1",
-    "gulp-mocha": "^3.0.1",
+    "gulp-mocha": "^4.0.1",
     "gulp-rename": "^1.2.2",
     "gulp-sass": "^3.1.0",
     "gulp-sourcemaps": "^2.4.1",