Update changelog for v1.1.0 release

Merge branch 'moriyoshi/refix-707' of git://github.com/moriyoshi/logr…

…us into fix_firehooks

changelog: add 1.0.5

changelog: 1.0.4

changelog: bump to v1.0.3

add changelog entry about making SetLevel public

readme: link to comment on casing

changelog: bump to v1.0.0

release 0.11.5

changelog: 0.11.4