transaction: change default version to 2

electrum/transaction.py

@@ -679,7 +679,7 @@ class Transaction:
         self._inputs = None
         self._outputs = None  # type: List[TxOutput]
         self.locktime = 0
-        self.version = 1
+        self.version = 2
         # by default we assume this is a partial txn;
         # this value will get properly set when deserializing
         self.is_partial_originally = True
@@ -787,11 +787,13 @@ class Transaction:
         return d
 
     @classmethod
-    def from_io(klass, inputs, outputs, locktime=0):
+    def from_io(klass, inputs, outputs, locktime=0, version=None):
         self = klass(None)
         self._inputs = inputs
         self._outputs = outputs
         self.locktime = locktime
+        if version is not None:
+            self.version = version
         self.BIP69_sort()
         return self