Merge pull request #69 from Seelengrab/readme_update

Link to JSON RPC specification in the README

Author: davidanthoff

README.md

@@ -1,2 +1,5 @@
 # JSONRPC
 
+An implementation for JSON RPC 2.0. See [the specification](https://www.jsonrpc.org/specification) for details.
+
+Currently, only JSON RPC 2.0 is supported. This package can act as both a client & a server.