Merge pull request #27 from openqasm/remove-import

Remove unnecessary import

Author: braised-babbage

source/openpulse/openpulse/ast.py

@@ -18,10 +18,6 @@
 # pylint: disable=unused-import
 from openqasm3.ast import *
 
-# The statement above does not import ExternArgument. Remove when it is fixed.
-# pylint: disable=unused-import
-from openqasm3.ast import ExternArgument
-
 
 # From Pulse grammar
 @dataclass