chore: add changelog preamble (aws#1415)

Required for changelog-parser to be able to extract the version descriptions during release to github.
skinny85 · Dec 20, 2018 · 91ecdda · 91ecdda
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+# Change Log
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+All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
+
 # [0.21.0](https://github.com/awslabs/aws-cdk/compare/v0.20.0...v0.21.0) (2018-12-20)