Fix doc link

Author: hdgarrood

README.md

@@ -4,6 +4,6 @@ Type declarations and FFI wrappers for Node's Buffer class.
 
 ## Module documentation
 
+* [Node.Encoding](docs/Node/Encoding.md)
 * [Node.Buffer](docs/Node/Buffer.md)
-* [Node.Buffer.Encoding](docs/Node/Buffer/Encoding.md)
 * [Node.Buffer.Unsafe](docs/Node/Buffer/Unsafe.md)