build(semantic-release): improved semantic-release flow

Author: ahmadnassri

.travis.yml

@@ -1,6 +1,7 @@
 language: node_js
 
 node_js:
+ - 8
  - 7
  - 6
  - 4
@@ -13,7 +14,7 @@ cache:
     - node_modules
 
 after_success:
-  - npm install --only=production codeclimate-test-reporter semantic-release
+  - npm install --no-save --only=production codeclimate-test-reporter semantic-release
 
 before_deploy:
   - npm run coverage -- --coverage-report=text-lcov | codeclimate-test-reporter
@@ -25,7 +26,7 @@ deploy:
 
   on:
     branch: master
-    node: 7
+    node: 8
 
 branches:
   except: