build: Move semantic-release to CI (#25)

* build: Move semantic-release to CI

* chore: Add package-lock.json

* build: Remove some old Travis stuff

* build: Use Node 8 explicetly

Author: okonet

.travis.yml

@@ -1,24 +1,17 @@
-sudo: false
 language: node_js
 cache:
   directories:
     - node_modules
 notifications:
   email: false
 node_js:
-  - stable
+  - '8'
   - '6'
   - '4'
 before_install:
   - npm i -g npm@^5.0.0
-before_script:
-  - npm prune
 after_success:
-  - 'curl -Lo travis_after_all.py https://git.io/travis_after_all'
-  - python travis_after_all.py
-  - export $(cat .to_export_back) &> /dev/null
-  - npm install -g semantic-release
-  - semantic-release
+  - travis-deploy-once "npm install -g semantic-release@13 && semantic-release"
 branches:
   except:
     - /^v\d+\.\d+\.\d+$/