design: fix issue link in TEMPLATE

sbinet · sbinet · commit d6d12b18909d · 2016-08-27T14:10:12.000+02:00
diff --git a/design/TEMPLATE b/design/TEMPLATE
@@ -6,7 +6,7 @@ Author(s): [Author Name, Co-Author Name]
 
 Last updated: [Date]
 
-Discussion at https://github.com/go-interpreter/proposal/issue/NNNNN.
+Discussion at https://github.com/go-interpreter/proposal/issues/NNNNN.
 
 ## Abstract
 
