Update documentation version and release date for v1.3.4.

README.md

doc/libogg/bitpacking.html

doc/libogg/datastructures.html

doc/libogg/decoding.html

doc/libogg/encoding.html

doc/libogg/general.html

doc/libogg/index.html

doc/libogg/ogg_iovec_t.html

doc/libogg/ogg_packet.html

doc/libogg/ogg_packet_clear.html

doc/libogg/ogg_page.html

doc/libogg/ogg_page_bos.html

doc/libogg/ogg_page_checksum_set.html

doc/libogg/ogg_page_continued.html

doc/libogg/ogg_page_eos.html

doc/libogg/ogg_page_granulepos.html

doc/libogg/ogg_page_packets.html

doc/libogg/ogg_page_pageno.html

doc/libogg/ogg_page_serialno.html

doc/libogg/ogg_page_version.html