Update CHANGELOG for v1.0.0

***NO_CI***

Author: nfbot

CHANGELOG.md

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 # Changelog
+
+## [**Changes available only in 'Preview' NuGet packages:**](https://github.com/nanoframework/System.Net.Sockets.TcpClient/tree/HEAD)
+
+[Full Changelog](https://github.com/nanoframework/System.Net.Sockets.TcpClient/compare/dcf36f728a998317c6d26244cfb54afbd9c17659...HEAD)
+
+**Implemented enhancements:**
+
+- Updates for TcpClient repo [\#2](https://github.com/nanoframework/System.Net.Sockets.TcpClient/pull/2)
+- Initial commit [\#1](https://github.com/nanoframework/System.Net.Sockets.TcpClient/pull/1)
+
+
+
+\* *This Changelog was automatically generated by [github_changelog_generator](https://github.com/github-changelog-generator/github-changelog-generator)*