message: Update CHANGELOG for 1.14.0-beta1
diff: * There currently is no completion support for package references in csproj files. ([#1156](https://github.com/OmniSharp/omnisharp-vscode/issues/1156))
  * As an alternative, consider installing the [MSBuild Project Tools](https://marketplace.visualstudio.com/items?itemName=tintoy.msbuild-project-tools) extension by @tintoy.
  +## 1.14.0 _(Not Yet Released)_
  +
  +#### Editor
  +
  +* Fix to allow signature help return results for attribute constructors. ([#1814](https://github.com/OmniSharp/omnisharp-vscode/issues/1814), PR: [omnisharp-roslyn#1007](https://github.com/OmniSharp/omnisharp-roslyn/pull/1007))
  +
  +#### Project System
  +
  +* Addressed problems with projects not being refreshed by OmniSharp after a package restore. ([#1583](https://github.com/OmniSharp/omnisharp-vscode/issues/1583), [#1661](https://github.com/OmniSharp/omnisharp-vscode/issues/1661), [#1785](https://github.com/OmniSharp/omnisharp-vscode/issues/1785), PR: [omnisharp-roslyn#1003](https://github.com/OmniSharp/omnisharp-roslyn/pull/1003))
  +
  ## 1.13.1 (November 13, 2017)
  * Addressed problem with Sdk-style projects not being loaded properly in certain cases. ([#1846](https://github.com/OmniSharp/omnisharp-vscode/issues/1846), [#1849](https://github.com/OmniSharp/omnisharp-vscode/issues/1849), PR: [omnisharp-roslyn#1021](https://github.com/OmniSharp/omnisharp-roslyn/pull/1021))
  