Roll to pickup pool changes

packages/barback/lib/src/graph/phase_output.dart

Index: packages/barback/lib/src/graph/phase_output.dart
diff --git a/packages/barback/lib/src/graph/phase_output.dart b/packages/barback/lib/src/graph/phase_output.dart
index 3d6460b657e3d9edcb90f4e82bdf8d22f6acb448..7967d6a7c034b3f7930024fec06b545e2083f1cd 100644
--- a/packages/barback/lib/src/graph/phase_output.dart
+++ b/packages/barback/lib/src/graph/phase_output.dart
@@ -50,7 +50,8 @@ class PhaseOutput {
   AssetCollisionException get collisionException {
     if (_assets.length == 1) return null;
     return new AssetCollisionException(
-        _assets.where((asset) => asset.transform != null)
+        _assets
+            .where((asset) => asset.transform != null)
             .map((asset) => asset.transform.info),
         output.id);
   }