use the 6.7

Author: akshita31

.travis.yml

@@ -12,7 +12,7 @@ before_install:
       sh -e /etc/init.d/xvfb start;
       sleep 3;
     fi
-  - dpkg --compare-versions `npm -v` ge 5.8 || npm i -g npm@^6.7.0
+  - dpkg --compare-versions `npm -v` ge 6.7 || npm i -g npm@^6.7
 
 addons:
   apt: