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Fall back to GRAPH.QUERY when GRAPH.RO_QUERY is not available. (#124)

* `GRAPH.RO_QUERY` is unavailable in older versions. So fallback to GRAPH.QUERY when the command is not found. * Call the same method by setting read_only to `False`

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redisgraph
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`‎redisgraph/graph.py‎`

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Original file line number	Diff line number	Diff line change
`@@ -177,6 +177,9 @@ def query(self, q, params=None, timeout=None, read_only=False):`
`177`	`177`	`except redis.exceptions.ResponseError as e:`
`178`	`178`	`if "wrong number of arguments" in str(e):`
`179`	`179`	`print("Note: RedisGraph Python requires server version 2.2.8 or above")`
	`180`	`+ if "unknown command" in str(e) and read_only:`
	`181`	+ # `GRAPH.RO_QUERY` is unavailable in older versions.
	`182`	`+ return self.query(q, params, timeout, read_only=False)`
`180`	`183`	`raise e`
`181`	`184`	`except VersionMismatchException as e:`
`182`	`185`	`# client view over the graph schema is out of sync`

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Commit 4e2be1e

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`‎redisgraph/graph.py‎`

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