Closes#296
BREAKING CHANGE: This removes the redisReplyReader* functions, which are
already replaced by redisReader* functions.
It renames `redisReplyReaderSetPrivdata`,
`redisReplyReaderGetObject` and `redisReplyReaderGetError`
to `redisReaderSetPrivdata`, `redisReaderGetObject`
and `redisReaderGetError`.