Add issue template and other fixes

Author: mosuem

.github/ISSUE_TEMPLATE/http_parser.md

@@ -0,0 +1,5 @@
+---
+name: "package:http_parser"
+about: "Create a bug or file a feature request against package:http_parser."
+labels: "package:http_parser"
+---

pkgs/http_parser/pubspec.yaml

@@ -2,7 +2,7 @@ name: http_parser
 version: 4.1.0
 description: >-
   A platform-independent package for parsing and serializing HTTP formats.
-repository: https://github.com/dart-lang/http_parser
+repository: https://github.com/dart-lang/http/tree/master/pkgs/http_parser
 
 environment:
   sdk: ^3.4.0