Remove -dev.infinity in SDK upper constraint

Author: kevmoo

pubspec.yaml

@@ -4,7 +4,7 @@ author: Dart Team <[email protected]>
 homepage: https://github.com/dart-lang/http_throttle
 description: HTTP client middleware that throttles requests.
 environment:
-  sdk: ">=1.13.0 <2.0.0-dev.infinity"
+  sdk: ">=1.13.0 <2.0.0"
 dependencies:
   http: ">=0.9.0 <0.12.0"
   pool: ">=1.0.0 <2.0.0"