feat: replace canvas with jest-canvas-mock (#335)

src/setupTest.js

@@ -3,6 +3,7 @@
 import Enzyme from 'enzyme';
 import Adapter from 'enzyme-adapter-react-16';
 import 'babel-polyfill';
+import 'jest-canvas-mock';
 
 Enzyme.configure({ adapter: new Adapter() });