Update CHANGELOG for v1.0.0

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Author: nfbot

CHANGELOG.md

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+# Changelog
+
+## [**Changes available only in 'Preview' NuGet packages:**](https://github.com/nanoframework/lib-nanoFramework.Graphics/tree/HEAD)
+
+[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Graphics/compare/v1.0.0-preview.1...HEAD)
+
+**Documentation and other chores:**
+
+- Update 3 NuGet dependencies [\#6](https://github.com/nanoframework/lib-nanoFramework.Graphics/pull/6)
+- Update 5 NuGet dependencies [\#5](https://github.com/nanoframework/lib-nanoFramework.Graphics/pull/5)
+- Update 5 NuGet dependencies [\#4](https://github.com/nanoframework/lib-nanoFramework.Graphics/pull/4)
+
+## [v1.0.0-preview.1](https://github.com/nanoframework/lib-nanoFramework.Graphics/tree/v1.0.0-preview.1) (2020-05-23)
+
+[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Graphics/compare/v1.0.6-preview.1...v1.0.0-preview.1)
+
+**Implemented enhancements:**
+
+- First Preview [\#3](https://github.com/nanoframework/lib-nanoFramework.Graphics/pull/3)
+
+## [v1.0.6-preview.1](https://github.com/nanoframework/lib-nanoFramework.Graphics/tree/v1.0.6-preview.1) (2019-11-20)
+
+[Full Changelog](https://github.com/nanoframework/lib-nanoFramework.Graphics/compare/e93c9c967e6ba04b5a05f98e2b337c7a2158cdf2...v1.0.6-preview.1)
+
+
+
+\* *This Changelog was automatically generated by [github_changelog_generator](https://github.com/github-changelog-generator/github-changelog-generator)*