Add note about project.json support being disabled to CHANGELOG

CHANGELOG.md

@@ -3,6 +3,15 @@ All changes to the project will be documented in this file.
 
 ## [1.32.0] - _Not Yet Released_
 * Added new `/codestructure` endpoint which serves a replacement for the `/currentfilemembersastree` endpoint. The new endpoint has a cleaner design, properly supports all C# types and members, and supports more information, such as accessibility, static vs. instance, etc. (PR: [#1211](https://github.com/OmniSharp/omnisharp-roslyn/pull/1211))
+* The legacy project.json support is now disabled by default, allowing OmniSharp to start up a bit faster for common scenarios. If you wish to enable project.json support, add the following setting to your `omnisharp.json` file. (PR: [#1194](https://github.com/OmniSharp/omnisharp-roslyn/pull/1194))
+
+    ```JSON
+    {
+        "dotnet": {
+            "enabled": false
+        }
+    }
+    ```
 
 ## [1.31.1] - 2018-05-28
 * Fixed bug where diagnostics from loaded `.cake` files was shown in the current file. (PR: [#1201](https://github.com/OmniSharp/omnisharp-roslyn/pull/1201))