adds cron as a type of event that can trigger a slack notification (#56)

.travis.yml

@@ -14,8 +14,8 @@ env:
   - secure: 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
 notifications:
   slack:
-    if: branch = master AND type = push
+    if: branch = master AND (type = push OR type=cron)
     on_success: change
     on_failure: always
     rooms:
-      -  secure: 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
+      -  secure: 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