Update README.md

Author: Ravi Prakash Joshi

lib/README.md

@@ -1,7 +1,7 @@
 # Note
 Older versions of `protobuf` might be installed already. Hence, in order to ignore the conflict, we are using locally installed `protobuf`
 
-# Steps
+# Steps to setup `protobuf`
 1. Download the `protobuf-3.5.0.tar.gz` from release page. The URL of the file is [here](https://github.com/ravijo/ros_protocol_buffer_tutorial/releases/download/1/protobuf-3.5.0.tar.gz)
 1. Place extracted `protobuf-3.5.0.tar.gz` here. The directory structure should look as following: