Change references in README.md from John to Fred.

README.md

@@ -500,15 +500,15 @@ echoserver the command line option `-a`.
 
     $ ./examples/echoserver/echoserver -a ./keys/ca-cert-ecc.pem
 
-The echoserver and client have a fake user named "john" whose certificate
+The echoserver and client have a fake user named "fred" whose certificate
 will be used for authentication.
 
 An example echoserver / client connection using the example certificate
-john-cert.der would be:
+fred-cert.der would be:
 
-    $ ./examples/echoserver/echoserver -a ./keys/ca-cert-ecc.pem -K john:./keys/john-cert.der
+    $ ./examples/echoserver/echoserver -a ./keys/ca-cert-ecc.pem -K fred:./keys/fred-cert.der
 
-    $ ./examples/client/client -u john -J ./keys/john-cert.der -i ./keys/john-key.der
+    $ ./examples/client/client -u fred -J ./keys/fred-cert.der -i ./keys/fred-key.der
 
 
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