Update ISSUE_TEMPLATE

Author: yuin

.github/ISSUE_TEMPLATE.md

@@ -1,3 +1,6 @@
+You **must** post issues only here. Questions, ideas **must** be posted in 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. 
 

go.mod

@@ -1,10 +1,11 @@
 module github.com/yuin/gopher-lua
 
-go 1.14
+go 1.17
+
+require github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e
 
 require (
 	github.com/chzyer/logex v1.1.10 // indirect
-	github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e
 	github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1 // indirect
 	golang.org/x/sys v0.0.0-20190204203706-41f3e6584952 // indirect
 )