Show window on dock icon click

[RobbieTheWagner]

Closes #278

[RobbieTheWagner]

@amaurymartiny it keeps telling me this.app.on is not a function. Any ideas?

[amaury1093]

Ah yeah, for tests, we mock the Electron app object. In src/mocks/electron.ts, could you please add:

export const app = {
  getAppPath: jest.fn(() => MOCK_APP_GETAPPPATH),
  isReady: (): Promise<void> => Promise.resolve(),
+  on: (): void => {
+   /* Do nothing */
+  }
};

[RobbieTheWagner]

@amaurymartiny updated, thanks!

[RobbieTheWagner]

@amaurymartiny thanks for merging! When do you think a new release will be out with these changes?

[amaury1093]

8.0.2 is out!