Error Solved- Type mismatch: inferred type is Activity? but Activity …

…was expected

After upgrading Flutter to 3.0, jitsi_meet was showing error as
jitsi_meet\JitsiMeetPlugin.kt: (66, 42): Type mismatch: inferred type is Activity? but Activity was expected

jitsi_meet/android/src/main/kotlin/com/gunschu/jitsi_meet/JitsiMeetPlugin.kt

@@ -31,7 +31,7 @@ public class JitsiMeetPlugin() : FlutterPlugin, MethodCallHandler, ActivityAware
 
     private var activity: Activity? = null
 
-    constructor(activity: Activity) : this() {
+    constructor(activity: Activity?) : this() {
         this.activity = activity
     }