Merge pull request #455 from watson-developer-cloud/rc-2.9.0

build(semantic-release): Install version 15.8.0 in travis build

Author: mediumTaj

.travis.yml

@@ -27,4 +27,4 @@ script:
 deploy:
   - provider: script
     skip_cleanup: true
-    script: npx travis-deploy-once "npx semantic-release"
+    script: npx travis-deploy-once "npx semantic-release@v15.8.0"