Log Message:
py-more-itertools: updated 5.0.0

5.0.0
* New itertools:
    * :func:split_into
    * :func:unzip
    * :func:substrings

* Changes to existing itertools:
    * :func:ilen was optimized a bit
    * :func:first_true now returns None by default. This is the reason for the \ 
major version bump - see below.

* Other changes:
   * Some code for old Python versions was removed
   * Some documentation mistakes were corrected
   * Tests now run properly on 32-bit versions of Python
   * Newer versions of CPython and PyPy are now tested against