backslash is not properly escaped

[yssrku]

poyonga/poyonga/client.py

Line 25 in 129bd8a

_cmd_arg = "".join([" --%s '%s'" % (d, str(kwargs[d]).replace("'", r"\'")) for d in kwargs])

# text is a double quote character
groonga.call("load", table="Docs", values='[{"_key": "mykey", "text": "\\""}]')

When a double quote character is in values JSON string, it is escaped with a preceding backslash.
This backslash is not properly escaped when quoted in a single quote.