Fixed npm dependency security issues

Signed-off-by: Jim Martens <github@2martens.de>

package.json

@@ -33,10 +33,12 @@
     "gulp-terser": "^1.2.0",
     "gulp-util": "^3.0.8",
     "localtunnel": "^1.9.2",
-    "micromatch": "^4.0.2",
-    "node-sass": "^4.12.0",
     "lodash": "^4.17.13",
-    "lodash.template": "^4.5.0"
+    "lodash.template": "^4.5.0",
+    "micromatch": "^4.0.2",
+    "mixin-deep": "^1.3.2",
+    "node-sass": "^4.12.0",
+    "set-value": "^2.0.1"
   },
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
@@ -47,5 +49,7 @@
   },
   "author": "Jim Martens",
   "license": "Apache-2.0",
-  "browserslist": ["last 2 versions"]
+  "browserslist": [
+    "last 2 versions"
+  ]
 }