Fix typo in README.md

Author: cinemast

README.md

@@ -14,7 +14,7 @@
 A [JSON-RPC](https://www.jsonrpc.org/) (1.0 & 2.0) framework implemented in C++17 using the [nlohmann's json for modern C++](https://github.com/nlohmann/json).
 
 -   JSON-RPC 1.0 and 2.0 compliant client
--   JSON-RCP 1.0 and 2.0 compliant server
+-   JSON-RPC 1.0 and 2.0 compliant server
 -   Transport agnostic interfaces
 -   Compile time type mapping (using [nlohmann's arbitrary type conversion](https://github.com/nlohmann/json#arbitrary-types-conversions))
 -   Runtime type checking