readme: add tcpsock:tlshandshake and tcpsock:sslhandshake to

implemented list.

Author: dndx

README.markdown

@@ -29,6 +29,7 @@ Table of Contents
     * [resty.core.phase](#restycorephase)
     * [resty.core.ndk](#restycorendk)
     * [resty.core.socket](#restycoresocket)
+    * [resty.core.socket_tcp](#restycoresocket_tcp)
     * [ngx.semaphore](#ngxsemaphore)
     * [ngx.balancer](#ngxbalancer)
     * [ngx.ssl](#ngxssl)
@@ -260,6 +261,13 @@ in the current request before you reusing the `ctx` table in some other place.
 
 [Back to TOC](#table-of-contents)
 
+## resty.core.socket_tcp
+
+* [tcpsock:tlshandshake](https://github.com/openresty/lua-nginx-module#tcpsocktlshandshake)
+* [tcpsock:sslhandshake](https://github.com/openresty/lua-nginx-module#tcpsocksslhandshake)
+
+[Back to TOC](#table-of-contents)
+
 ## resty.core.ndk
 
 * [ndk.set_var](https://github.com/openresty/lua-nginx-module#ndkset_vardirective)