- update to 8.1.2:
  * Fix a regression on systems with uninitialized locale (:issue:`3575`).
  * Use environment markers to filter packages before determining if a
    required wheel is supported. Solves (:issue:`3254`).
  * Make glibc parsing for `manylinux1` support more robust for the variety of
    glibc versions found in the wild (:issue:`3588`).
  * Update environment marker support to fully support PEP 508 and legacy
    environment markers (:issue:`3624`).
  * Always use debug logging to the ``--log`` file (:issue:`3351`).
  * Don't attempt to wrap search results for extremely narrow terminal windows
    (:issue:`3655`).
  * Fix regression with non-ascii requirement files on Python 2 and add support
    for encoding headers in requirement files (:issue:`3548`, :pull:`3547`).

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