Docs: Note experimental support for yarn

doc/user/compliance/license_compliance/index.md

@@ -58,7 +58,7 @@ Java 8 and Gradle 1.x projects are not supported. The minimum supported version
 
 | Language   | Package managers                                                                             | Notes |
 |------------|----------------------------------------------------------------------------------------------|-------|
-| JavaScript | [Bower](https://bower.io/), [npm](https://www.npmjs.com/)                                    |       |
+| JavaScript | [Bower](https://bower.io/), [npm](https://www.npmjs.com/) (7 and earlier)                    |       |
 | Go         | [Godep](https://github.com/tools/godep), [go mod](https://github.com/golang/go/wiki/Modules) |       |
 | Java       | [Gradle](https://gradle.org/), [Maven](https://maven.apache.org/)                            |       |
 | .NET       | [NuGet](https://www.nuget.org/)                                                              | The .NET Framework is supported via the [mono project](https://www.mono-project.com/). There are, however, some limitations. The scanner doesn't support Windows-specific dependencies and doesn't report dependencies of your project's listed dependencies. Also, the scanner always marks detected licenses for all dependencies as `unknown`. |