Disable Travis Email notifications

There are so many of them that they are just annoyting
and for some reason there isn't feature of telling
Travis not to send notifications to me.

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

.travis.yml

 # dist: trusty # KVM Setup
 
+notifications:
+  email: false
+
 os:
   - linux
   - osx