Add warning when hiredis not installed. Recommend installation. #1621
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Description of change
Adds warning when hiredis parser not available. Recommends installing it.
Why the change?
redispy works best with the hiredis parser.
Currently, if an out-of-date hiredis parser is installed a warning is given (the warning recommends upgrading the hiredis parser)
Surprisingly, when no version of the hiredis parser is available, redispy silently defaults to a native python parser with much poorer performance.
Instead of silently defaulting to a native python parser, this change warns the potentially unaware user and recommends installing the hiredis parser.