Encode security log data payload to json

Initialize Dhizuku with context
fix #85

app/src/main/java/com/bintianqi/owndroid/Receiver.kt

@@ -66,7 +66,9 @@ class Receiver : DeviceAdminReceiver() {
     override fun onSecurityLogsAvailable(context: Context, intent: Intent) {
         super.onSecurityLogsAvailable(context, intent)
         if(VERSION.SDK_INT >= 24) {
-            handleSecurityLogs(context)
+            CoroutineScope(Dispatchers.IO).launch {
+                handleSecurityLogs(context)
+            }
         }
     }