pikepdf back-end added

What's Changed

• change the backend to pikepdf instead of abandoned pypdf by @gonultasbu in #2

New Contributors

• @gonultasbu made their first contribution in #2

Full Changelog: v0.2...v0.3.0win

mac OS X Release 2

Run from terminal using ./pdf_merge command.

Windows Release 2

Click-to-run executable.

Linux Release 2

./pdf_merge to run.

Windows Release

Click-to-run executable for Windows.

mac OS X Release

Run from terminal using ./pdf_merge command.

Linux Release

v0.1

Added script