Prepare release of shelf_router_generator 1.1.3 (#489)

Author: isoos

pkgs/shelf_router_generator/CHANGELOG.md

@@ -1,4 +1,4 @@
-## 1.1.3-wip
+## 1.1.3
 
 * Require `analyzer: ^8.1.1`
 * Require `build: ^4.0.0`

pkgs/shelf_router_generator/pubspec.yaml

@@ -1,5 +1,5 @@
 name: shelf_router_generator
-version: 1.1.3-wip
+version: 1.1.3
 description: >
   A package:build-compatible builder for generating request routers for the
   shelf web-framework based on source annotations.