message: move to tslint-no-unused-expression-chai
  The package was already installed, but not used. This makes our tests that use chai.should() pass tslint checks
diff: {
  "rules": {
  - "no-unused-expression-chai": true,
  + "tslint-no-unused-expression-chai": true,
  "no-unused-variable": true,
  "no-duplicate-variable": true,
  "no-var-keyword": true,
  