fix(dependencies): nsubstitute no longer required

Unity auto upgrade overwrote a sensitive asmdef file that started pulling in test files. This patch
restores things back to the expected functionality.

#18

Assets/FluidBehaviorTree/Tests/Editor/Fluid.BehaviorTree.EditorTests.asmdef

@@ -2,24 +2,17 @@
     "name": "Fluid.BehaviorTree.EditorTests",
     "references": [
         "Fluid.BehaviorTree",
-        "Fluid.BehaviorTree.Editor",
-        "UnityEngine.TestRunner",
-        "UnityEditor.TestRunner"
+        "Fluid.BehaviorTree.Editor"
     ],
     "includePlatforms": [
         "Editor"
     ],
     "excludePlatforms": [],
-    "allowUnsafeCode": false,
-    "overrideReferences": true,
     "precompiledReferences": [
         "nunit.framework.dll",
         "NSubstitute.dll"
     ],
-    "autoReferenced": false,
-    "defineConstraints": [
-        "UNITY_INCLUDE_TESTS"
-    ],
-    "versionDefines": [],
-    "noEngineReferences": false
-}
+    "optionalUnityReferences": [
+        "TestAssemblies"
+    ]
+}

Packages/manifest.json

@@ -12,13 +12,13 @@
     "clever-crow.nsubstitute": "2.0.3",
     "com.unity.2d.sprite": "1.0.0",
     "com.unity.2d.tilemap": "1.0.0",
-    "com.unity.ads": "2.0.8",
+    "com.unity.ads": "3.4.5",
     "com.unity.analytics": "3.3.5",
     "com.unity.collab-proxy": "1.2.16",
     "com.unity.ide.rider": "1.1.4",
-    "com.unity.ide.vscode": "1.1.4",
+    "com.unity.ide.vscode": "1.2.0",
     "com.unity.purchasing": "2.0.6",
-    "com.unity.test-framework": "1.1.9",
+    "com.unity.test-framework": "1.1.14",
     "com.unity.textmeshpro": "2.0.1",
     "com.unity.timeline": "1.2.10",
     "com.unity.ugui": "1.0.0",

ProjectSettings/ProjectVersion.txt

@@ -1,2 +1,2 @@
-m_EditorVersion: 2019.3.0f6
-m_EditorVersionWithRevision: 2019.3.0f6 (27ab2135bccf)
+m_EditorVersion: 2019.3.15f1
+m_EditorVersionWithRevision: 2019.3.15f1 (59ff3e03856d)