[ci] Updata sky_api gem name in travis

Author: stdevMac

.travis.yml

@@ -25,7 +25,7 @@ before_deploy:
 deploy:
   - provider: releases
     file:
-    - "./lib/skyapi/skyapi-$(echo ${TRAVIS_TAG} | cut -d'v' -f 2).gem"
+    - "./lib/skyapi/sky_api-$(echo ${TRAVIS_TAG} | cut -d'v' -f 2).gem"
     - "./lib/skycoin/skycoin-$(echo ${TRAVIS_TAG} | cut -d'v' -f 2).gem"
     skip_cleanup: true
     on: