fix: Move enzyme-adapter-react-16 to devDependencies

Author: huchenme

package.json

@@ -79,6 +79,7 @@
     "create-react-class": "^15.6.3",
     "cross-env": "^5.2.0",
     "enzyme": "^3.1.0",
+    "enzyme-adapter-react-16": "^1.2.0",
     "eslint": "^4.19.1",
     "eslint-config-airbnb": "^16.1.0",
     "eslint-config-prettier": "^2.9.0",
@@ -116,7 +117,6 @@
     "@babel/runtime": "7.0.0-beta.42",
     "classnames": "^2.2.5",
     "dom-helpers": "^3.2.0",
-    "enzyme-adapter-react-16": "^1.2.0",
     "invariant": "^2.2.4",
     "keycode": "^2.2.0",
     "prop-types": "^15.6.1",