Release of NUnit3TestAdapter 3.15

_posts/2019-08-23-NUnit3TestAdapter-3.15.md

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+NUnit3TestAdapter version 3.15.0 is released.
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+This release is a major performance improvement release. When used from Visual Studio, and used with a selection of tests, it will significantly speed up the discovery of those. Note that discovery is also a part of the execution, so you will also see the performance improvement for execution. It will be mostly noticable when you have a large set of tests.
+  
+See [the release notes](https://github.com/nunit/docs/wiki/Adapter-Release-Notes) for details on what has changed in 3.15.  
+[Download NuGet package](https://www.nuget.org/packages/NUnit3TestAdapter/3.15.0)
+[Download VSIX](https://marketplace.visualstudio.com/items?itemName=NUnitDevelopers.NUnit3TestAdapter)