Add Enzyme configuration to Jest's setup file
Add Enzyme configuration to Jest's setup file

To run test for React 16 apps, it needs to upgrade Enzyme 3. And
Enzyme v3 needs configuration about adapter(new feature). This app uses
react 16 so it uses enzyme-adapter-react-16 as adapter.

muryoimpl/talker-signupper,muryoimpl/talker-signupper,muryoimpl/talker-signupper