- update to 4.2:
  * Add module support; add support for disabling output and switch
    markup; add support for reconfiguring stdin/stdout; support
    repeated curly braces with functional expression; add
    backward-compatible `Case` abstraction for match markup; add
    more preprocessing and postprocessing commands via command
    line options.

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- update to 4.1:
  * Add support for extension markup `@((...))`, `@[[...]]`,
   `@{{...}}`, `@<...>`, etc., with custom callbacks retained for
   backward compatibility; add `@[match]` control support; add
   interpreter cores for overriding interpreter behavior; add more
   command line option toggles; add notion of verbose/brief errors;
   more uniform error message formatting; various documentation
   updates.

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- update to 4.0.1:
  * bugfixes over 4.0, no dedicated changelog available

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- update to 4.0:
  * http://www.alcyone.com/software/empy/ANNOUNCE.html#changes

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