Explicitly mark JEP 154 / JDK-8046144 as April Fools joke

[some-java-user-99206970363698485155 at vodafonemail.de]

Thanks for all your comments on this! And also thanks Chen for the 
information regarding the latest plans for Serialization.

I generally find the JEPs to be a great source of information, also to 
understand the rationale for changes and to gain more insight into the 
background or history of Java features. Therefore my main concern with 
such a non-serious JEP is that it 'taints' this information source and 
that this incorrect information is spread. To someone not familiar with 
Java Serialization implementation details and its history, it might not 
be obvious that the information in the JEP is made up.
Here are some more cases where this JEP was mentioned and where it 
potentially caused confusion:

  * https://www.reddit.com/r/java/comments/1bfg6f/comment/c96cwxd
  * https://www.reddit.com/r/programming/comments/8mdp1n/comment/dzmzyql
  * https://stackoverflow.com/a/57463104


The problem with such a 'persistent' April Fools joke which is not 
revealed / marked as such afterwards is that people might be reading it 
at any later point, e.g. now in June. And they might generally not pay 
much attention to the publishing date (except for the year maybe).

At least Chen added a comment to JDK-8046144 now which refers to this 
discussion here (thanks for that!).
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