doc: updated the Version section to reflect the release date.

Author: agentzh

README.markdown

@@ -67,8 +67,8 @@ Version
 =======
 
 This document describes ngx_lua
-[v0.10.16](https://github.com/openresty/lua-nginx-module/tags), which is not
-released yet.
+[v0.10.16](https://github.com/openresty/lua-nginx-module/tags), which was released
+on 2 July, 2020.
 
 Synopsis
 ========

doc/HttpLuaModule.wiki

@@ -15,8 +15,8 @@ Production ready.
 = Version =
 
 This document describes ngx_lua
-[https://github.com/openresty/lua-nginx-module/tags v0.10.16], which is not
-released yet.
+[https://github.com/openresty/lua-nginx-module/tags v0.10.16], which was released
+on 2 July, 2020.
 
 = Synopsis =
 <geshi lang="nginx">