Update ISSUE_TEMPLATE.md

Author: yuin

.github/ISSUE_TEMPLATE.md

@@ -1,5 +1,4 @@
-You **must** post issues only here. Questions, ideas **must** be posted in discussions. 
-
+You **must** post issues only here. Questions, ideas **must** be posted in [discussions](https://github.com/yuin/gopher-lua/discussions). 
 
 - [ ] GopherLua is a Lua5.1 implementation. You should be familiar with Lua programming language. Have you read [Lua 5.1 reference manual](http://www.lua.org/manual/5.1/) carefully?
 - [ ] GopherLua is a Lua5.1 implementation.  In Lua, to keep it simple, **it is more important to remove functionalities rather than to add functionalities unlike other languages** . If you are going to introduce some new cool functionalities into the GopherLua code base and the functionalities can be implemented by existing APIs, It should be implemented as a library.