travis: added a step to clone lua-resty-lrucache which is required by resty.core.

Author: thibaultcha

.travis.yml

@@ -60,6 +60,7 @@ install:
   - git clone https://github.com/openresty/echo-nginx-module.git ../echo-nginx-module
   - git clone https://github.com/openresty/memc-nginx-module.git ../memc-nginx-module
   - git clone https://github.com/openresty/headers-more-nginx-module.git ../headers-more-nginx-module
+  - git clone https://github.com/openresty/lua-resty-lrucache.git ../lua-resty-lrucache
   - git clone https://github.com/openresty/lua-resty-core.git ../lua-resty-core
 
 script: