Trying to fix Travis 4

Author: Lionel Bijaoui

.travis.yml

@@ -1,20 +1,11 @@
 language: node_js
 cache:
-	yarn: true
     directories:
         - node_modules
-
 node_js:
     - "10"
     - "8"
     - "6"
-
-install:
-	- npm install
-
-script:
-	- npm run test
-
 deploy:
     provider: npm
     email: $NPM_EMAIL
@@ -23,6 +14,5 @@ deploy:
     on:
         tags: true
         node: "8"
-
 after_success:
     - npm run coverall