pkg/shelf: formatted code

lib/src/shelf_unmodifiable_map.dart

Index: lib/src/shelf_unmodifiable_map.dart
diff --git a/lib/src/shelf_unmodifiable_map.dart b/lib/src/shelf_unmodifiable_map.dart
index 7cb5553e3036348ed42e7e1ca79bbf983f0d01c6..74b161e4d66210db4e76d94ec53bb748309eb1fd 100644
--- a/lib/src/shelf_unmodifiable_map.dart
+++ b/lib/src/shelf_unmodifiable_map.dart
@@ -47,6 +47,6 @@ class ShelfUnmodifiableMap<V> extends UnmodifiableMapView<String, V> {
 // TODO(kevmoo): Consider using MapView from dart:collection which has a const
 // ctor. Would require updating min SDK to 1.5.
 class _EmptyShelfUnmodifiableMap<V> extends pc.DelegatingMap<String, V>
-    implements ShelfUnmodifiableMap<V>  {
+    implements ShelfUnmodifiableMap<V> {
   const _EmptyShelfUnmodifiableMap() : super(const {});
 }