v5.0

PDF Format

Fixed an issue where PDFs were not recognized if the header contains data before the %PDF signature, or where the signature is in the format %!PS−Adobe−N.n PDF−M.m.

Thanks to @MaximeLaffaire for the contribution.

.NET Framework Targets Removed

.NET Framework 4.5.2 and 4.6.1 have been removed as specific target frameworks as these are no longer supported.