Merge branch 'initial-package-fixes' into 'master'

Initial package fixes

See merge request physiology/PulseUnityAsset!14

PulsePhysiologyEngine/Scripts/Editor/PulseEngineDriverEditor.cs

@@ -58,7 +58,6 @@ public class PulseEngineDriverEditor : Editor
 
             EditorGUILayout.HelpBox(message, MessageType.Warning);
 
-            stateFileProperty.objectReferenceValue = null;
             serializedObject.ApplyModifiedProperties();
             return;
         }

README.md

@@ -15,9 +15,8 @@ This repository is a collection of assets designed to integrate the [Pulse Physi
 
 ### From the Asset Store
 
-The Pulse Physiology Engine is **not yet available** on the Asset Store. In the meantime, follow the steps below to learn how to use the Pulse Unity Asset from released packages or from the git repository.
-
-Expected availability: by **08/03/2019**
+The Pulse Unity Asset is available for download on the [Unity Asset Store](
+http://u3d.as/1sp1).
 
 ### From a packaged release