ci: yarn --ignore-engines

Author: helderberto

Diff for: .travis.yml

@@ -1,15 +1,15 @@
 sudo: false
 language: node_js
 node_js:
-  - '8'
+  - '10'
 branches:
   only:
     - master
 cache:
   directories:
     - node_modules
 install:
-  - yarn
+  - yarn --ignore-engines
 script:
   - yarn test
   - yarn coveralls