add travis job

.travis.yml

@@ -0,0 +1,26 @@
+sudo: false
+language: node_js
+node_js:
+  - '8'
+  - '9'
+  - '10'
+  - '11'
+cache:
+  npm: true
+  directories:
+    - coverage
+notifications:
+  email: false
+branches:
+  only:
+    - master
+install: npm install
+script: npm run test
+jobs:
+  include:
+    - stage: release
+      node_js: '10'
+      install: npm install -g codecov
+      script:
+        - codecov
+        - npm run semantic-release

package.json

@@ -9,7 +9,7 @@
     "commit:all": "npm run commit:add && npm run commit",
     "test": "jest",
     "pretty-quick": "pretty-quick --staged --pattern '**/*.(js|jsx|ts|tsx)'",
-    "prepublish": "rm -rf dist; babel src --out-dir dist --ignore 'src/__tests__/*'",
+    "prepublishOnly": "rm -rf dist; babel src --out-dir dist --ignore 'src/__tests__/*'",
     "semantic-release": "semantic-release",
     "test:coverage": "jest --coverage",
     "test:watch": "jest --watch --coverage"