ci: drop old node version

Scrum · Scrum · commit 14d819decd91 · 2019-11-07T10:22:49.000+03:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,8 +3,6 @@ node_js:
   - v10
   - v9
   - v8
-  - v7
-  - v6
 
 after_success:
   - './node_modules/.bin/nyc report --reporter=text-lcov | ./node_modules/.bin/coveralls'
