chore(commitlint): add commitlint (americanexpress#172)

.travis.yml

@@ -4,6 +4,10 @@ node_js:
   - "9"
   - "10"
   - "12"
+before_install:
+  # Create a master branch for commitlint
+  # https://github.com/conventional-changelog/commitlint/issues/6
+  - git remote set-branches origin master && git fetch
 deploy:
   on:
     tags: true

commitlint.config.js

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2020 American Express Travel Related Services Company, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,either express
+ * or implied. See the License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+module.exports = {
+  extends: ['@commitlint/config-conventional'],
+  rules: {
+    'scope-case': [2, 'always', ['pascal-case', 'camel-case', 'kebab-case']],
+  },
+};