Updating to Unity 2020.1.8f1.

Packages/manifest.json

     "com.unity.ide.vscode": "1.2.2",
     "com.unity.inputsystem": "1.0.0",
     "com.unity.purchasing": "2.1.1",
-    "com.unity.test-framework": "1.1.16",
+    "com.unity.test-framework": "1.1.18",
     "com.unity.textmeshpro": "3.0.1",
     "com.unity.ugui": "1.0.0",
     "com.unity.xr.arcore": "4.1.0-preview.9",

ProjectSettings/ProjectVersion.txt

-m_EditorVersion: 2020.1.6f1
-m_EditorVersionWithRevision: 2020.1.6f1 (fc477ca6df10)
+m_EditorVersion: 2020.1.8f1
+m_EditorVersionWithRevision: 2020.1.8f1 (22e8c0b0c3ec)