Merge pull request #667 from devopsdays/greenkeeper/gulp-htmlmin-5.0.1

chore(package): update gulp-htmlmin to version 5.0.1

Author: mattstratton

package.json

@@ -20,7 +20,7 @@
     "gulp": "^4.0.0",
     "gulp-cache": "^1.0.0",
     "gulp-concat": "^2.6.1",
-    "gulp-htmlmin": "^4.0.0",
+    "gulp-htmlmin": "^5.0.1",
     "gulp-hub": "^4.2.0",
     "gulp-imagemin": "^4.0.0",
     "gulp-img-retina": "0.0.4",