debian/source: added "debian/bitcoin.pdf" in "include-binaries" file.
debian/source: added "debian/bitcoin.pdf" in "include-binaries" file.

Signed-off-by: Mario Oyorzabal Salgado <b18a7e10f98c9c002366d3f18262b43313a1c765@tuxsoul.com>

tuxsoul/bitcoin,tuxsoul/bitcoin