feat: update material-ui@4.x (#123)

* chore: update material-ui@4.x

* test: update test for ActionBar and TestField

* chore: add types

* chore: update types

* test: update test for Author

* chore: fixed bunch of unit test

* chore: remove unused import

* chore: remove comments

* chore: replace shallow my mount

* chore: update git hooks

* chore: fix styles

* chore: update dependencies

* chore: remove types material-ui

src/components/Link/Link.test.tsx

@@ -1,5 +1,5 @@
 import React from 'react';
-import { shallow } from 'enzyme';
+import { mount } from 'enzyme';
 
 import Link from './Link';
 
@@ -8,7 +8,7 @@ describe('<Link /> component', () => {
     to: 'https://github.com/verdaccio/ui',
   };
   test('should render the component in default state', () => {
-    const wrapper = shallow(<Link blank={true} to={props.to} />);
+    const wrapper = mount(<Link blank={true} to={props.to} />);
     expect(wrapper.html()).toMatchSnapshot();
   });
 });