fix typo in changelog

Signed-off-by: Niv Sardi <xaiki@evilgiggle.com>
fix last changelog entry
Imported Upstream version 2.5.1
Merge tag 'upstream/2.5.1'

Upstream version 2.5.1
update changelog
reenable assembler optimizations on ppc64el
enable rtmp on powerpcspe, x265 on hppa and zvbi on hurd and kfreebsd
prepare new upload
Merge branch 'master' into wheezy

Conflicts:
	debian/changelog
	debian/control
	debian/rules