doc: added 1 more video.

Author: agentzh

README.markdown

@@ -86,6 +86,10 @@ Videos
 
     [![OpenResty's resty Command-Line Utility Demo](https://img.youtube.com/vi/L1c7aw4mSOo/0.jpg)](https://youtu.be/L1c7aw4mSOo)
 
+* YouTube video "[Measure Execution Time of Lua Code Correctly in OpenResty](https://youtu.be/VkRYW_qLoME)"
+
+    [![Measure Execution Time of Lua Code Correctly in OpenResty](https://img.youtube.com/vi/VkRYW_qLoME/0.jpg)](https://youtu.be/VkRYW_qLoME)
+
 You are welcome to subscribe to our [official YouTube channel, OpenResty](https://www.youtube.com/channel/UCXVmwF-UCScv2ftsGoMqxhw).
 
 [Back to TOC](#table-of-contents)

doc/HttpLuaModule.wiki

@@ -32,6 +32,10 @@ on 3 Nov, 2020.
 
     [![OpenResty's resty Command-Line Utility Demo](https://img.youtube.com/vi/L1c7aw4mSOo/0.jpg)](https://youtu.be/L1c7aw4mSOo)
 
+* YouTube video "[Measure Execution Time of Lua Code Correctly in OpenResty](https://youtu.be/VkRYW_qLoME)"
+
+    [![Measure Execution Time of Lua Code Correctly in OpenResty](https://img.youtube.com/vi/VkRYW_qLoME/0.jpg)](https://youtu.be/VkRYW_qLoME)
+
 You are welcome to subscribe to our [official YouTube channel, OpenResty](https://www.youtube.com/channel/UCXVmwF-UCScv2ftsGoMqxhw).
 
 = Synopsis =