Update README.md to specify latest crate

Knifa · Knifa · commit 05f8efee8550 · 2016-05-06T16:29:13.000+01:00
diff --git a/README.md b/README.md
@@ -13,7 +13,7 @@ The crate is called `redis` and you can depend on it via cargo:
 
 ```ini
 [dependencies]
-redis = "0.5.2"
+redis = "0.5.3"
 ```
 
 Documentation on the library can be found at
