Fix uses_dynamic_as_bottom error (#86)

diff --git a/lib/src/mock.dart b/lib/src/mock.dart
index 4a6bfb8..1ee223f 100644
--- a/lib/src/mock.dart
+++ b/lib/src/mock.dart
@@ -667,7 +667,7 @@
   return (List<dynamic> _) {
     _verificationInProgress = false;
     DateTime dt = new DateTime.fromMillisecondsSinceEpoch(0);
-    var tmpVerifyCalls = new List.from(_verifyCalls);
+    var tmpVerifyCalls = new List<_VerifyCall>.from(_verifyCalls);
     _verifyCalls.clear();
     List<RealCall> matchedCalls = [];
     for (_VerifyCall verifyCall in tmpVerifyCalls) {