Travis build is failing

[DonJayamanne]

Travis build is failing with the following error:
src/test/index.ts(11,5): error TS2345: Argument of type '{ ui: string; useColors: true; timeout: number; retries: number; }' is not assignable to parameter of type 'MochaSetupOptions'. Object literal may only specify known properties, and 'retries' does not exist in type 'MochaSetupOptions'.

[DonJayamanne]

Mocha supports retries, but the typescript definition files dont. Looks like the definition file (npm dependency) changed, causing the build to fail.

[DonJayamanne]

Might have to start committing a package-lock.json file.

[brettcannon]

Yes, we should start committing the lock file.