Add chevrotain module declaration
Add chevrotain module declaration

Otherwhise TypeScript somehow does not detect chevrotain's types.

atomfrede/generator-jhipster,jhipster/generator-jhipster,jhipster/generator-jhipster,atomfrede/generator-jhipster,jhipster/generator-jhipster,jhipster/generator-jhipster,atomfrede/generator-jhipster,atomfrede/generator-jhipster,jhipster/generator-jhipster,atomfrede/generator-jhipster