Removes the first count occurrences of elements equal to value from the list
stored at key.
The count argument influences the operation in the following ways:
count > 0: Remove elements equal tovaluemoving from head to tail.count < 0: Remove elements equal tovaluemoving from tail to head.count = 0: Remove all elements equal tovalue.
For example, LREM list -2 "hello" will remove the last two occurrences of
"hello" in the list stored at list.
Note that non-existing keys are treated like empty lists, so when key does not
exist, the command will always return 0.
@return
@integer-reply: the number of removed elements.
@examples
RPUSH mylist "hello"
RPUSH mylist "hello"
RPUSH mylist "foo"
RPUSH mylist "hello"
LREM mylist -2 "hello"
LRANGE mylist 0 -1