TransactionScope isn't supported everywhere

Dapper.Tests.Contrib/TestSuite.cs

@@ -648,7 +648,7 @@ public void Transactions()
                 Assert.Equal(car.Name, orgName);
             }
         }
-
+#if TRANSCOPE
         [Fact]
         public void TransactionScope()
         {
@@ -664,6 +664,7 @@ public void TransactionScope()
                 }
             }
         }
+#endif
 
         [Fact]
         public void InsertCheckKey()