added CHANGELOG

Author: mzdr

CHANGELOG.md

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+# [1.0.1]
+###### 2016-09-09
+
+A tiny patch release which eliminates two bugs. 🐞
+
+###### Fixed
+- Calendar window position being offset on multiple monitors
+- Preferences and about window being opened multiple times
+
+# 1.0.0
+###### 2016-09-04
+
+First public release! 🎉
+
+[1.0.1]: https://github.com/mzdr/timestamp/compare/1.0.0...1.0.1