Merge pull request #14 from hashicorp/changelog

add CHANGELOG.md

CHANGELOG.md

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+# 0.1.0 (July 3, 2020)
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+Initial release. 
+
+This Go module contains two packages, `github.com/hashicorp/terraform-exec/tfexec`, and `github.com/hashicorp/terraform-exec/tfinstall`, which share the same version.