Merge branch 'master' into v4.0.0-branch

Author: dpopp07

.travis.yml

@@ -14,6 +14,7 @@ script:
 - tsc
 - if [ "${TRAVIS_PULL_REQUEST}" = "false" ]; then npm run test-travis; else npm run
   test-unit-travis; fi
+- npm run check-packages
 - sh scripts/typedoc/generate_typedoc.sh
 after_success:
 - npm run report-coverage

CHANGELOG.md

@@ -1,3 +1,10 @@
+## [3.18.1](https://github.com/watson-developer-cloud/node-sdk/compare/v3.18.0...v3.18.1) (2019-02-14)
+
+
+### Bug Fixes
+
+* use dotenv v5 to maintain node 4.x compatibility ([c311651](https://github.com/watson-developer-cloud/node-sdk/commit/c311651))
+
 # [3.18.0](https://github.com/watson-developer-cloud/node-sdk/compare/v3.17.0...v3.18.0) (2019-02-06)