travis: added lua-resty-core & lua-resty-lrucache.

Author: xiaocang

.travis.yml

@@ -41,6 +41,8 @@ install:
  - git clone https://github.com/openresty/nginx-devel-utils.git
  - git clone https://github.com/simpl/ngx_devel_kit.git ../ndk-nginx-module
  - git clone https://github.com/openresty/lua-nginx-module.git ../lua-nginx-module
+ - git clone https://github.com/openresty/lua-resty-core.git ../lua-resty-core
+ - git clone https://github.com/openresty/lua-resty-lrucache.git ../lua-resty-lrucache
  - git clone https://github.com/openresty/no-pool-nginx.git ../no-pool-nginx
  - git clone -b v2.1-agentzh https://github.com/openresty/luajit2.git
  - git clone https://github.com/openresty/mockeagain.git