update changelog now that the udp_socket fix is back-ported to RC_0_16

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10058 a83610d8-ad2a-0410-a6ab-fc0612d85776
remove leftover comparison from when there was more than one proxy setting

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10060 a83610d8-ad2a-0410-a6ab-fc0612d85776
fixed typo

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10061 a83610d8-ad2a-0410-a6ab-fc0612d85776