Replace Fabric plugin with Firebase plugin

app/build.gradle.kts

@@ -1,7 +1,7 @@
 plugins {
     id("com.android.application")
     id("checkstyle")
-    id("io.fabric")
+    id("com.google.firebase.crashlytics")
     kotlin("android")
     kotlin("kapt")
     id("com.cookpad.android.plugin.license-tools") version "1.2.2"

build.gradle.kts

@@ -2,14 +2,12 @@ buildscript {
     repositories {
         jcenter()
         google()
-        maven("https://maven.fabric.io/public")
     }
 
     dependencies {
         classpath("com.android.tools.build:gradle:4.0.0")
         classpath("com.google.gms:google-services:4.3.3")
-        // https://docs.fabric.io/android/changelog.html#fabric-gradle-plugin
+        classpath("com.google.firebase:firebase-crashlytics-gradle:2.1.1")
-        classpath("io.fabric.tools:gradle:1.31.2")
         classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${Versions.kotlin}")
     }
 }