flush(), close() stream.

Author: tatarize

vpype_gcode/gwrite.py

@@ -158,6 +158,7 @@ def gwrite(document: vp.Document, output: typing.TextIO, profile: str):
     if document_end is not None:
         output.write(document_end.format(filename=filename))
     output.flush()
+    output.close()
 
     return document