Another try at secure token with travis

This time encrypting with #builds and -r "runtimeco/mcuboot"

Signed-off-by: Fabio Utzig <utzig@apache.org>
diff --git a/.travis.yml b/.travis.yml
index 2634f78..ee26d39 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,5 +9,5 @@
 notifications:
   slack:
     rooms:
-      - secure: "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"
+      - secure: "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"
     on_success: always