document increment by

Author: githiago-f

README.md

@@ -5,8 +5,10 @@
 | SET | SET key value | `SET myKey "Hello"` | "OK"|
 | GET | GET key | `GET myKey` | "Hello"|
 | DEL | DEL key[...key] | `DEL myKey` | 1 |
-| INCR | INCR key | `INCR myLikes` | n+1|
-| MGET | MGET key[...key] | `GET myKey myLikes invalidKey` | "Hello"</br>1</br>nil|
+| INCR | INCR key | `INCR myLikes` | n+1 |
+| MGET | MGET key[...key] | `GET myKey myLikes invalidKey` | "Hello"</br>1</br>nil |
+| INCRBY | INCRBY key number | `INCRBY myLikes -1` | n-1 |
+| INCRBYFLOAT | INCRBYFLOAT key float | `INCRBYFLOAT myLikes 0.01` | n+0.01 |
 <!-- | KEYS | KEYS patter* | `KEYS my*` | | -->
 <!-- | EXPIRE | EXPIRE key seconds | `EXPIRE myKey 10` | 1 |  -->
 <!-- | EXISTS | EXISTS key[...key] | `EXISTS myKey myLikes` | 1, 0|  -->