Added CHANGELOG.md

Author: mrgswift

CHANGELOG.md

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+**v1.0.3** - Added Laravel 7 Support + Bug fix preventing AES-256-CBC cipher from working properly **(Everyone should update to this version for everything to work properly)** 
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+**v1.0.2** - Bug fix: EnvFileWriter no longer pulls wrong values from .env file
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+**v1.0.1** - Refactored Decrypt class removing unnecessary loop, spelling corrections in config file & Readme
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+**v1.0.0** - Intial committed package