Add changelog

Author: bviktor

CHANGELOG.md

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+## killinuxfloor 1.1 (2019-05-15)
+
+* Add support for bans via `killinuxfloor ban` command
+* Fix failing Workshop downloads caused by old Steam libraries shipped with KF2
+* Fix failing `killinuxfloor status` when KF2 isn't running
+* Fix webadmin erroneously allowing changes to automatically generated map cycles
+
+## killinuxfloor 1.0 (2019-01-11)
+
+* Initial release