add travis2slack webhook (#172)

diff --git a/.travis.yml b/.travis.yml
index ce79a21..2b9de2a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,13 @@
 services:
 - docker
 
+notifications:
+  email: false
+  webhooks:
+    urls:
+      # travis2slack webhook to enable DMs on openwhisk-team.slack.com to PR authors with TravisCI results
+      secure: "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"
+
 env:
   global:
     - secure: "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"