Remove unused async imports (dart-lang/package_config#91)
Since this version doesn't support Dart pre 2.0, these imports are unnecessary.
diff --git a/pkgs/package_config/lib/discovery.dart b/pkgs/package_config/lib/discovery.dart
index a2f53c0..a72bb12 100644
--- a/pkgs/package_config/lib/discovery.dart
+++ b/pkgs/package_config/lib/discovery.dart
@@ -5,7 +5,6 @@
@Deprecated("Use the package_config.json based API")
library package_config.discovery;
-import "dart:async";
import "dart:io";
import "dart:typed_data" show Uint8List;