[elastic] Fix the deploy failure.

Author: Henry Wong

.travis.yml

@@ -43,7 +43,7 @@ matrix:
         skip_cleanup: true
         local_dir: go-langserver-linux-amd64.tar.gz
         on:
-          branch: master
+          branch: release
 
     - name: Unit Tests & Package | OSX
       os: osx
@@ -60,7 +60,7 @@ matrix:
         skip_cleanup: true
         local_dir: go-langserver-darwin-amd64.tar.gz
         on:
-          branch: master
+          branch: release
 
     - name: Unit Tests & Package | Windows
       os: windows
@@ -80,4 +80,4 @@ matrix:
         skip_cleanup: true
         local_dir: go-langserver-windows-amd64.zip
         on:
-          branch: master
+          branch: release