remove extra semicolon

README.md

@@ -917,7 +917,7 @@ NLOHMANN_JSON_SERIALIZE_ENUM( TaskState, {
     {TS_STOPPED, "stopped"},
     {TS_RUNNING, "running"},
     {TS_COMPLETED, "completed"},
-});
+})
 ```
 
 The `NLOHMANN_JSON_SERIALIZE_ENUM()` macro declares a set of `to_json()` / `from_json()` functions for type `TaskState` while avoiding repetition and boilerplate serilization code.