Enable builds for Tarantool 1.7

Author: Konstantin Nazarov

.travis.yml

@@ -24,7 +24,8 @@ env:
 
 script:
   - git clone https://github.com/tarantool/build.git
-  - ./build/pack/travis.sh
+  - PACKAGECLOUD_REPO=tarantool/1_6 REPO_PREFIX=1.6 ./build/pack/travis.sh
+  - PACKAGECLOUD_REPO=tarantool/1_7 REPO_PREFIX=1.7 ./build/pack/travis.sh
 
 notifications:
   email: true