Make dart-reddit Dart2 compatible

lib/reddit.dart

@@ -2,7 +2,8 @@ library reddit;
 
 import "dart:async";
 import "dart:collection";
-import "dart:convert" show JSON;
+import "dart:convert" show json;
+import 'dart:core';
 
 import "package:http/http.dart";
 import "package:logging/logging.dart";

lib/src/listing.dart

@@ -81,7 +81,7 @@ class Listing extends FilterableQuery implements Stream<ListingResult> {
  *
  * The method [fetchMore] allows to request the next batch of data.
  */
-class ListingResult extends MapMixin implements Map<String,dynamic> {
+class ListingResult extends MapMixin {
   Map<String,dynamic> _result;
   Listing _listing;
 

lib/src/query.dart

@@ -19,7 +19,7 @@ class Query {
     Response response = await _reddit._client.get(uri);
     Reddit.logger.finer("Response code ${response.statusCode}");
     try {
-      return JSON.decode(response.body) as Map;
+      return json.decode(response.body) as Map;
     } on FormatException catch (e) {
       var exc =
           new RedditApiException("Exception in parsing JSON from $uri", e);
@@ -43,7 +43,7 @@ class Query {
   }
 }
 
-@proxy
+// @proxy
 class FilterableQuery extends Query {
   /// The allowed filters
   Iterable<String> _filters;

pubspec.yaml

@@ -1,4 +1,7 @@
 name: reddit
+environment:
+  sdk: ">=2.0.0 <3.0.0"
+
 description: A Reddit library for Dart.
 version: 0.5.0
 author: Steven Roose <stevenroose@gmail.com>
@@ -8,4 +11,4 @@ dependencies:
   logging: ">=0.11.0 <0.12.0"
   oauth2: ">=1.0.1 <2.0.0"
 dev_dependencies:
-  unittest: any
+  test: ^1.5.1+1

test/fullname_test.dart

@@ -1,7 +1,7 @@
 library reddit.test.fullname;
 
 import "package:reddit/reddit.dart";
-import "package:unittest/unittest.dart";
+import "package:test/test.dart";
 
 void main() {
   group("fullname", () {

test/reddit_uri_test.dart

@@ -1,7 +1,7 @@
 library reddit.test.uri;
 
 import "package:reddit/reddit.dart";
-import "package:unittest/unittest.dart";
+import "package:test/test.dart";
 
 void main() {
   group("RedditUri", () {