Turn off travis' email notifications

Author: JohnTitor

.travis.yml

@@ -19,8 +19,7 @@ script:
 - git log --oneline | head -n 10
 - mdbook build
 notifications:
-  email:
-    on_success: never
+  email: false
 env:
   global:
     secure: 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