Add change log file

Author: bgreen-litl

CHANGELOG.md

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+# Change Log
+
+## [v1.0.3] - 2014-06-05
+### Changed
+- Make logging unicode safe
+- Log on_predicate backoff as INFO rather than ERROR
+
+## [v1.0.4] - 2014-08-12
+### Added
+- Python 2.6 support from @Bonko
+- Python 3.0 support from @robyoung
+- Run tests in Travis from @robyoung
+
+## [v1.0.5] - 2015-02-03
+### Changed
+- Add a default interval of 1 second for the constant generator
+- Improve on_predicate stop condition avoiding extra sleep
+
+## [v1.0.6] - 2015-02-10
+### Added
+- Coveralls.io integration from @singingwolfboy
+
+### Changed
+- Fix logging bug for function calls with tuple params
+
+## [v1.0.7] - 2015-02-10
+
+### Changed
+- Fix string formatting for python 2.6
+
+## [v1.1.0] - 2015-12-08
+### Added
+- Event handling for success, backoff, and giveup
+- Change log
+
+### Changed
+- Docs and test for multi exception invocations
+- Update dev environment test dependencies