Fix links in README.md

Author: lucapette

README.md

@@ -95,13 +95,13 @@ ENV PROXY_REQUEST_BUFFERING="true"
   - SEND_TIMEOUT : see [send_timeout](http://nginx.org/en/docs/http/ngx_http_core_module.html#send_timeout)
   - CLIENT_BODY_TIMEOUT : see [client_body_timeout](http://nginx.org/en/docs/http/ngx_http_core_module.html#client_body_timeout)
   - CLIENT_HEADER_TIMEOUT : see [client_header_timeout](http://nginx.org/en/docs/http/ngx_http_core_module.html#client_header_timeout)
-  - KEEPALIVE_TIMEOUT : see [keepalive_timeout](http://nginx.org/en/docs/http/ngx_http_core_module.html#keepalive_timeout
+  - KEEPALIVE_TIMEOUT : see [keepalive_timeout](http://nginx.org/en/docs/http/ngx_http_core_module.html#keepalive_timeout)
   - PROXY_READ_TIMEOUT : see [proxy_read_timeout](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_read_timeout)
   - PROXY_CONNECT_TIMEOUT : see [proxy_connect_timeout](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_connect_timeout)
   - PROXY_SEND_TIMEOUT : see [proxy_send_timeout](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_send_timeout)
   - PROXY_CONNECT_READ_TIMEOUT : see [proxy_connect_read_timeout](https://github.com/chobits/ngx_http_proxy_connect_module#proxy_connect_read_timeout)
   - PROXY_CONNECT_CONNECT_TIMEOUT : see [proxy_connect_connect_timeout](https://github.com/chobits/ngx_http_proxy_connect_module#proxy_connect_connect_timeout)
-  - PROXY_CONNECT_SEND_TIMEOUT : see [proxy_connect_send_timeout](https://github.com/chobits/ngx_http_proxy_connect_module#proxy_connect_send_timeout))
+  - PROXY_CONNECT_SEND_TIMEOUT : see [proxy_connect_send_timeout](https://github.com/chobits/ngx_http_proxy_connect_module#proxy_connect_send_timeout)
 
 
 ### Simple (no auth, all cache)