Merge pull request #20 from gilzoide/automatic-unity-iap-detection

Automatically define `SINGULAR_SDK_IAP_ENABLED` when Unity IAP package is installed

Author: nursingular

SingularSDK/Runtime/SingularSDK.asmdef

@@ -11,6 +11,12 @@
     "precompiledReferences": [],
     "autoReferenced": true,
     "defineConstraints": [],
-    "versionDefines": [],
+    "versionDefines": [
+        {
+            "name": "com.unity.purchasing",
+            "expression": "",
+            "define": "SINGULAR_SDK_IAP_ENABLED"
+        }
+    ],
     "noEngineReferences": false
 }