move mockjs to devdependencies

@@ -14,12 +14,12 @@
     "ant-design-pro": "^2.1.1",
     "antd": "^3.10.9",
     "dva": "^2.4.0",
-    "mockjs": "^1.0.1-beta3",
     "numeral": "^2.0.6",
     "react": "^16.6.3",
     "umi-request": "^1.0.0"
   },
   "devDependencies": {
+    "mockjs": "^1.0.1-beta3",
     "umi": "^2.3.0-beta.1",
     "umi-plugin-react": "^1.3.0-beta.1",
     "umi-plugin-block-dev": "^1.0.0"