Update readme

Author: ianopolous

README.md

@@ -1,10 +1,12 @@
-# java-multihash
+# java-multibase
 A Java implementation of Multibase
 
 ## Usage
+```java
 byte[] data = ...
 String encoded = Multibase.encode(Multibase.Base.Base58BTC, data);
 byte[] decoded = Multibase.decode(encoded);
+```
 
 ## Compilation
 To compile just run ant.