fixed typo in README.md

Author: chobits

README.md

@@ -146,7 +146,7 @@ This module disables nginx REWRITE phase for CONNECT request by default, which m
 $ wget http://nginx.org/download/nginx-1.9.2.tar.gz
 $ tar -xzvf nginx-1.9.2.tar.gz
 $ cd nginx-1.9.2/
-$ patch -p1 < /path/to/ngx_http_proxy_connect_module/proxy_connect.patch
+$ patch -p1 < /path/to/ngx_http_proxy_connect_module/patch/proxy_connect.patch
 $ ./configure --add-module=/path/to/ngx_http_proxy_connect_module
 $ make && make install
 ```