Create CHANGELOG.md

Author: arjan-s

CHANGELOG.md

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+# ChangeLog
+
+This file details the changes that were made after forking v1.1.4 from https://github.com/allanlei/python-zipstream.
+
+## v1.1.5 (2019-03-18)
+* Support Zip64 when compressing iterables and strings (https://github.com/allanlei/python-zipstream/pull/25)
+
+## v1.1.6 (2019-06-06)
+* Add partial flushing of ZipStreams (https://github.com/arjan-s/python-zipstream/pull/1)
+
+## v1.1.7 (2019-10-22)
+* Stream data in the order it was received (https://github.com/arjan-s/python-zipstream/pull/4)