Update changelog

Author: DustinCampbell

CHANGELOG.md

@@ -20,6 +20,7 @@
 
 #### Project System
 
+* Mono targets and tasks are now located properly when Mono is installed. This enables support for many Mono-based projects types, such as Xamarin.iOS, Xamarin.Android, MonoGame, etc. ([#1597](https://github.com/OmniSharp/omnisharp-vscode/issues/1597), [#1624](https://github.com/OmniSharp/omnisharp-vscode/issues/1624), [#1396](https://github.com/OmniSharp/omnisharp-vscode/issues/1396) [omnisharp-roslyn#892](https://github.com/OmniSharp/omnisharp-roslyn/issues/892), PR: [omnisharp-roslyn#923](https://github.com/OmniSharp/omnisharp-roslyn/pull/923))
 * Use MSBuild solution parsing API, which is the official parser for handling weird solution file cases. ([1580](https://github.com/OmniSharp/omnisharp-vscode/issues/1580), PR: [omnisharp-roslyn#897](https://github.com/OmniSharp/omnisharp-roslyn/pull/897))
 * The MSBuild project system now calls the "Compile" target rather than the "ResolveReferences" target when processing MSBuild files. This has the effect of ensuring that other targets have the opportunity to run (such as targets that generate files) while still not building any output binaries. ([#1531](https://github.com/OmniSharp/omnisharp-vscode/issues/1531))
 * Binding redirects added for MSBuild assemblies, fixing issues with MSBuild tasks built with different versions of MSBuild. ([omnisharp-roslyn#903](https://github.com/OmniSharp/omnisharp-roslyn/issues/903))
@@ -34,6 +35,8 @@
 
 * Switched to a new CDN for the extension's dependencies which should deliver an improved download experience ([#1542](https://github.com/OmniSharp/omnisharp-vscode/issues/1542))
 * Automatically activate the extension when opening workspaces that contain any .csproj, .sln, or .csx files ([#1375](https://github.com/OmniSharp/omnisharp-vscode/issues/1375), [#1150](https://github.com/OmniSharp/omnisharp-vscode/issues/1150), PR: [#1592](https://github.com/OmniSharp/omnisharp-vscode/pull/1592)))
+* Added nag message when project.json projects are opened by OmniSharp, to serve as a reminder to migrate projects from project.json to .csproj. (PR: [#1657](https://github.com/OmniSharp/omnisharp-vscode/pull/1657))
+* The `[csharp]` configuration section is now checked for formatting options. ([#1574](https://github.com/OmniSharp/omnisharp-vscode/issues/1574)) _(Contributed by [@filipw](https://github.com/filipw))_
 * All project systems (project.json, MSBuild, CSX Scripting) now support an "Enabled" property that can be configured in omnisharp.json. (PR: [omnisharp-roslyn#902](https://github.com/OmniSharp/omnisharp-roslyn/pull/902)) _(Contributed by [@filipw](https://github.com/filipw))_
 * The OmniSharp server has been updated to Roslyn 2.3.0-beta2, which adds support for C# 7.1 (PRs: [omnisharp-roslyn#900](https://github.com/OmniSharp/omnisharp-roslyn/pull/900) and [omnisharp-roslyn#901](https://github.com/OmniSharp/omnisharp-roslyn/pull/901))