title: How to use logger with Koin?
body: <p>Koin version: 2.1.5</p>
  
  <p>Instructions are missing from documentation <a href="https://start.insert-koin.io/#/getting-started/starting-koin?id=starting-for-android" rel="nofollow noreferrer">here</a>.</p>
  
  <p>This is what I have:</p>
  
  <pre><code>class MyApp : Application() {
      override fun onCreate() {
          super.onCreate()
  
          startKoin {
              // use AndroidLogger as Koin Logger - default Level.INFO
              androidLogger()
  
              // use the Android context given there
              androidContext(this@MyApp)
  
              // module list
              modules(emptyList())
          }
      }
  }
  </code></pre>
  
  <pre><code>class MainActivity : AppCompatActivity() {
      private val logger : Logger by inject()
  
      override fun onCreate(savedInstanceState: Bundle?) {
          super.onCreate(savedInstanceState)
          setContentView(R.layout.activity_main)
  
          logger.debug("onCreate")
      }
  }
  
  </code></pre>
  
  <p>And looks like there is no instance of Logger in the dependency graph:</p>
  
  <pre><code>04-26 12:02:03.781 4672-4672/? E/AndroidRuntime: FATAL EXCEPTION: main
      Process: com.example.myapplication, PID: 4672
      java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.MainActivity}: org.koin.core.error.NoBeanDefFoundException: No definition found for class:'org.koin.core.logger.Logger'. Check your definitions!
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
          at android.app.ActivityThread.access$800(ActivityThread.java:151)
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
          at android.os.Handler.dispatchMessage(Handler.java:102)
          at android.os.Looper.loop(Looper.java:135)
          at android.app.ActivityThread.main(ActivityThread.java:5254)
          at java.lang.reflect.Method.invoke(Native Method)
          at java.lang.reflect.Method.invoke(Method.java:372)
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
       Caused by: org.koin.core.error.NoBeanDefFoundException: No definition found for class:'org.koin.core.logger.Logger'. Check your definitions!
          at org.koin.core.scope.Scope.throwDefinitionNotFound(Scope.kt:247)
          at org.koin.core.scope.Scope.resolveInstance(Scope.kt:216)
          at org.koin.core.scope.Scope.get(Scope.kt:181)
          at com.example.myapplication.MainActivity$$special$$inlined$inject$1.invoke(ComponentCallbackExt.kt:51)
          at kotlin.UnsafeLazyImpl.getValue(Lazy.kt:81)
          at com.example.myapplication.MainActivity.getLogger(MainActivity.kt)
          at com.example.myapplication.MainActivity.onCreate(MainActivity.kt:17)
          at android.app.Activity.performCreate(Activity.java:5990)
          at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
          at android.app.ActivityThread.access$800(ActivityThread.java:151) 
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
          at android.os.Handler.dispatchMessage(Handler.java:102) 
          at android.os.Looper.loop(Looper.java:135) 
          at android.app.ActivityThread.main(ActivityThread.java:5254) 
          at java.lang.reflect.Method.invoke(Native Method) 
          at java.lang.reflect.Method.invoke(Method.java:372) 
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
  </code></pre>
  
  <p>Why?</p>