Update change log for 1.0.0 release

CHANGELOG.md

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+# Change Log
+Notable features, fixes, and changes (breaking and non-breaking) between releases will be documented in this file.  [Semantic Versioning](http://semver.org) shall be used for version numbering in this project.
+
+## [1.0.0](https://github.com/AppliedInfrastructure/cassandra-snapshot-tools/tree/1.0.0) (2016-09-15)
+
+**New Features**
+
+* Initial commit of getSnapshot and putSnapshot utilities
+* Added basic documentation via README.md
+* Added contribution guidelines and change log
+
+**Fixes**
+
+**Changes**