Log Message:
pdated afl to 2.31b.

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Version 2.31b:
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  - Changed havoc cycle counts for a marked performance boost, especially
    with -S / -d. See the discussion of FidgetyAFL in:

    https://groups.google.com/forum/#!topic/afl-users/fOPeb62FZUg

    While this does not implement the approach proposed by the authors of
    the CCS paper, the solution is a result of digging into that research;
    more improvements may follow as I do more experiments and get more
    definitive data.

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Version 2.30b:
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  - Made minor improvements to persistent mode to avoid the remote
    possibility of "no instrumentation detected" issues with very low
    instrumentation densities.

  - Fixed a minor glitch with a leftover process in persistent mode.
    Reported by Jakub Wilk and Daniel Stender.

  - Made persistent mode bitmaps a bit more consistent and adjusted the way
    this is shown in the UI, especially in persistent mode.

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Version 2.29b:
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  - Made a minor #include fix to llvm_mode. Suggested by Jonathan Metzman.

  - Made cosmetic updates to the docs.

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Version 2.28b:
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  - Added "life pro tips" to docs/.

  - Moved testcases/_extras/ to dictionaries/ for visibility.

  - Made minor improvements to install scripts.

  - Added an important safety tip.

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Version 2.27b:
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  - Added libtokencap, a simple feature to intercept strcmp / memcmp and
    generate dictionary entries that can help extend coverage.

  - Moved libdislocator to its own dir, added README.

  - The demo in experimental/instrumented_cmp is no more.

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Version 2.26b:
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  - Made a fix for libdislocator.so to compile on MacOS X.

  - Added support for DYLD_INSERT_LIBRARIES.

  - Renamed AFL_LD_PRELOAD to AFL_PRELOAD.

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Version 2.25b:
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  - Made some cosmetic updates to libdislocator.so, renamed one env
    variable.

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Version 2.24b:
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  - Added libdislocator.so, an experimental, abusive allocator. Try
    it out with AFL_LD_PRELOAD=/path/to/libdislocator.so when running
    afl-fuzz.