casing matters for some reason tried BOT and it returns a 401. (#268)

Also got the name of the executable wrong in mytoken (damn copy paste...)

examples/mytoken/README.md

@@ -37,5 +37,5 @@ authentication.
 The below example shows how to start the bot using the bot user's token
 
 ```sh
-./pingpong -t "Bot YOUR_BOT_TOKEN"
+./mytoken  -t "Bot YOUR_BOT_TOKEN"
 ```

examples/pingpong/README.md

@@ -42,5 +42,5 @@ authentication.
 The below example shows how to start the bot using the bot user's token
 
 ```sh
-./pingpong -t "BOT YOUR_BOT_TOKEN"
+./pingpong -t "Bot YOUR_BOT_TOKEN"
 ```