Merge pull request #5 from gedoor/atbest

去掉pref

app/src/main/java/io/legado/app/App.kt

@@ -1,19 +1,15 @@
 package io.legado.app
 
 import android.app.Application
-import android.content.SharedPreferences
 
 class App : Application() {
 
     companion object{
-        lateinit var instance:App
-        lateinit var configPreferences:SharedPreferences
+        lateinit var INSTANCE: App
     }
 
     override fun onCreate() {
         super.onCreate()
-        instance = this
-        configPreferences = getSharedPreferences("CONFIG", 0)
-
+        INSTANCE = this
     }
 }