title: Manifest merger failed with Firebase Auth
body: <p>When I implement </p>
  
  <pre><code>implementation 'com.google.firebase:firebase-core:17.0.0'
  implementation 'com.google.firebase:firebase-auth:18.0.0'
  </code></pre>
  
  <p>The Manifest not Sync, Error message like this:</p>
  
  <p>ERROR: Manifest merger failed : Attribute application@appComponentFactory value=(android.support.v4.app.CoreComponentFactory) from [com.android.support:support-compat:28.0.0] AndroidManifest.xml:22:18-91
      is also present at [androidx.core:core:1.0.0] AndroidManifest.xml:22:18-86 value=(androidx.core.app.CoreComponentFactory).
      Suggestion: add 'tools:replace="android:appComponentFactory"' to  element at AndroidManifest.xml:7:5-25:19 to override.</p>
  
  <p>My manifest doc:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 28
      defaultConfig {
          applicationId "com.gokhanyilmaz.appseriestracker"
          minSdkVersion 21
          targetSdkVersion 28
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      implementation 'com.android.support:appcompat-v7:28.0.0'
      implementation 'com.android.support.constraint:constraint-layout:1.1.3'
      implementation 'com.android.support:design:28.0.0'
      implementation 'com.android.support:cardview-v7:28.0.0'
      implementation 'com.squareup.picasso:picasso:2.71828'
      implementation 'com.google.firebase:firebase-core:17.0.0'
      implementation 'com.google.firebase:firebase-auth:18.0.0'
      implementation 'com.google.android.gms:play-services-auth:17.0.0'
      testImplementation 'junit:junit:4.12'
      androidTestImplementation 'com.android.support.test:runner:1.0.2'
      androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
  }
  apply plugin: 'com.google.gms.google-services'
  </code></pre>