chore(devDependencies): move stylus and stylus-loader to devDependencies (#7)

Author: rogeralbinoi

package.json

@@ -11,8 +11,6 @@
     "test:unit": "vue-cli-service test:unit"
   },
   "dependencies": {
-    "stylus": "^0.54.5",
-    "stylus-loader": "^3.0.2",
     "vanilla-lazyload": "^8.17.0",
     "vue": "^2.5.21"
   },
@@ -28,7 +26,9 @@
     "babel-jest": "^23.6.0",
     "eslint": "^5.8.0",
     "eslint-plugin-vue": "^5.0.0",
-    "vue-template-compiler": "^2.5.21"
+    "vue-template-compiler": "^2.5.21",
+    "stylus": "^0.54.5",
+    "stylus-loader": "^3.0.2"
   },
   "eslintConfig": {
     "root": true,