Add a CHANGELOG

CHANGELOG.md

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+## 4.0-0.10.3 (2017-09-06)
+**Breaking Change**
+* Update embedded TF to 0.10.3
+* In order to support validate in TF 0.10.3 add `vars` to validate command.
+This is not compatible with older versions of TF.
+
+## 3.0-0.9.11 (2017-09-06)
+**Breaking Change**
+* Removed `secrets` key
+
+**Added Features**
+* Added support for `destroy`
+* Add ability to specify TF version to use via `tf_version`