Ignore redis.set_repl in miniredis

[TingluoHuang]

You can use redis.set_repl() to change replication mode in lua script.
Doc: https://redis.io/docs/interact/programmability/lua-api/

I have a lua script that using the redis.set_repl() and hit a compile error with miniredis
ERR Error compiling script (new function): :9: attempt to call a non-function object stack traceback: :9: in main chunk [G]: ?

Maybe we can follow #44 to also ignore the redis.set_repl() command since it's not something miniredis interested.