PDFio 1.6.2

PDFio 1.6.2 is a bug fix release:

    https://github.com/michaelrsweet/pdfio/releases/tag/v1.6.2

Changes include:

- Increased the maximum length of a single string to 128k (Issue #146)
- Added missing range checks to `pdfioArrayCopy` and `pdfioDictCopy`.
- Refactored PDF encryption code to fix unlocking with certain files.
- Improved xref table loop detection (Issue #148)
- Changed how duplicate objects are handled in PDF files (Issue #155)
- Fixed xref reconstruction for objects lacking a `Type` value.
- Fixed `pdfioPageOpenStream` for indirect `Contents` arrays.
- Fixed an error propagation bug when reading too-long values (Issue #146)
- Fixed a bug when converting Unicode characters above plane 0 (issue #159)
- Fixed a Clang warning.

Enjoy!

________________________
Michael Sweet