init fails if running in an existing TS project

[beatfactor]

If running npm init nightwatch in an existing TS project, the initialization fails with SyntaxError:

Installing the following packages:
- @types/nightwatch

Installing @types/nightwatch
Done! 

SyntaxError: Unexpected token } in JSON at position 438
    at JSON.parse (<anonymous>)

See also #33

[garg3133]

This seems to be due to a syntax error in the tsconfig.json file of your existing TS project.

[beatfactor]

No, the tsconfig.json is fine.