Updated Feature suggestions (markdown)

Feature-suggestions.md

@@ -2,6 +2,8 @@ What features would you like to see in Nim
 
 (Use [needed-libraries repository](https://github.com/nim-lang/needed-libraries) for asking for libraries in the Nim Ecosystem.)
 
+- additional string concatenation at assignment. Example `let a = "a" + "b"` or `let a = "a", "b"`. Both resulting in the string "ab". `let a = "a", "b"` seems more appropriate since `echo "a", "b"` already works.
+
 - Range to sequence and array. Example `let a = [1..3]` would be the same as `let a = [1, 2, 3]`, both resulting in `[1, 2, 3]`
 
 - "pure" mode - force usage of scoped variables (unless imported by from... import) and exact case match (like golang does).