Drop the run order for fix_open

Because of the way the pattern has to be structured it is unnecessary.

Author: brettcannon

libmodernize/fixes/fix_open.py

@@ -6,13 +6,11 @@
 
 class FixOpen(fixer_base.BaseFix):
 
-    run_order = 10  # Run after fix_file.
     BM_compatible = True
     # Fixers don't directly stack, so make sure the 'file' case is covered.
     PATTERN = """
     power< ('open' | 'file') trailer< '(' any+ ')' > >
     """
 
     def transform(self, node, results):
-        touch_import(u'io', u'open', node)
-
+        libmodernize.touch_import(u'io', u'open', node)