message: Add changelog updates
diff: ## 1.16.0 _(Not Yet Released)_
  +#### Project System
  +
  +* Modified the existing "Restore Packages" option in the Command Palette into two distinct functionalities:
  +
  + * "Restore Project" - Displays a drop-down that shows all the available projects in the solution or in the workspace. Selecting one of them would trigger a dotnet restore for the particular project.
  + * "Restore All Projects" - Triggers a dotnet restore for all projects in the current solution or workspace.
  +
  +* Modified the "Unresolved dependencies" prompt to restore the all the projects in the currently selected solution or workspace.
  +
  +#### Misc
  +
  +* Added a prompt to "Restart OmniSharp" when there is a change in omnisharp "path", "useGlobalMono" or "waitForDebugger" settings.(PR: [#2316] https://github.com/OmniSharp/omnisharp-vscode/pull/2316)
  +
  #### Editor
  * Improved diagnostics by refreshing them when the active editor changes or the current window is focused. (PR: [#2317](https://github.com/OmniSharp/omnisharp-vscode/pull/2317)) _(Contributed by [@SirIntruder](https://github.com/SirIntruder))
  #### Editor
  * Fixed regression where the "Generate Type in New File" code action would create an empty file. ([#2112](https://github.com/OmniSharp/omnisharp-vscode/issues/2112), PR: [omnisharp-roslyn#1143](https://github.com/OmniSharp/omnisharp-roslyn/pull/1143))
  -* Made several improvments to the display of tooltips in Signature Help. ([#1940](https://github.com/OmniSharp/omnisharp-vscode/issues/1940), PR: [#1958](https://github.com/OmniSharp/omnisharp-vscode/pull/1958))
  +* Made several improvements to the display of tooltips in Signature Help. ([#1940](https://github.com/OmniSharp/omnisharp-vscode/issues/1940), PR: [#1958](https://github.com/OmniSharp/omnisharp-vscode/pull/1958))
  #### Options
  