5.2.0

This is a new minor version of Tesseract 5.

• Improvements and fixes for continuous integration,
  autoconf and cmake builds.
• Set /Os for some 32 bit MS compilers (fixes #3769).
• Improve comments and other documentation.
• Add initial support for Intel AVX512F.
• Fix for very large PDF files on 32 bit hosts (fixes #3805).
• Fix NEON detection on FreeBSD.
• Fix regression with UZN files (fixes #3837).
• Fix calling delete[] for memory allocated by malloc in C API.
• Add an API function to init tesseract with traineddata from memory
  (fixes #3691).
• Replace direct access to Leptonica internal data structures by
  function calls and support latest releases of Leptonica.
• Replace std::regex by std::string functions (fixes issue #3830).
• Use compiled-in TESSDATA_PREFIX also on Windows (fixes #3767).
• Add new parameter 'invert_threshold', change the default threshold
  from 0.5 to 0.7 and mark parameter 'tessedit_do_invert' as deprecated.

See also list of all changes.