Add typescript and chai to dependencies

[aikoven]

When I do

$ npm install typescript-definition-tester

modules that are listed in devDependencies don't get installed and importing typescript-definition-tester fails because it can't find typescript and chai.

[adamcarr]

Thanks for reaching out. I'll address this in the next day or so.

[adamcarr]

These changes have been made and I pushed a new version to npmjs.org

[aikoven]

Great, thanks!