encrypt slackbot URL using this repo's key (#4)

.travis.yml

@@ -14,9 +14,7 @@ notifications:
   webhooks:
     urls:
       # travis2slack webhook to enable DMs on openwhisk-team.slack.com to PR authors with TravisCI results
-      secure: "@@@@@@@kjsdhfksadfsnddaVN8+Shkaty+WDhjTuCbVkliH4H2yJ3GMK2cf8pxhQz1Po0qJNxuyO9jDjQRbDG95b0PueBLcK0gMZZkjoe47lg
-      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"
-    enabled: false
+      secure: "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"
 
 before_install:
 - "./tools/travis/setup.sh"