feat: rework travis config;

feat: return yarn.lock file;

.gitignore

@@ -4,5 +4,4 @@
 node_modules
 dist
 coverage
-yarn.lock
 package-lock.json

.travis.yml

@@ -1,28 +1,32 @@
+os: linux
+
 language: node_js
 node_js: 12
 
-dist: trusty
-sudo: true
-addons:
-  firefox: latest
-  chrome: stable
-
-matrix:
-  fast_finish: true
-
 cache:
   yarn: true
 
-before_install:
-  - export DISPLAY=:99.0
-  - sh -e /etc/init.d/xvfb start
-
-script:
-  - yarn
-  - yarn lint
-  - yarn build
-  - yarn test
+jobs:
+  include:
+    - stage: test
+      addons:
+        firefox: latest
+        chrome: stable
+      dist: trusty
+      before_script:
+        - export DISPLAY=:99.0
+        - sh -e /etc/init.d/xvfb start
+      script:
+        - yarn lint
+        - yarn build
+        - yarn test
+      after_script:
+        - yarn add -D codacy-coverage
+        - cat ./coverage/lcov.info | codacy-coverage
 
-after_success:
-  - yarn add -D codacy-coverage && cat ./coverage/lcov.info | codacy-coverage
-  - npx semantic-release
+    - stage: release semantic-release
+      script: skip
+      deploy:
+        skip_cleanup: true
+        provider: script
+        script: yarn semantic-release