Add nullability in CrashlyticsTree

app/build.gradle

@@ -12,7 +12,7 @@ android {
         applicationId "chat.rocket.android"
         minSdkVersion 21
         targetSdkVersion versions.targetSdk
-        versionCode 1002
+        versionCode 1003
         versionName "2.0.0-dev2"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         multiDexEnabled true
@@ -123,4 +123,4 @@ task compileSdk(type:Exec) {
 }
 preBuild.dependsOn compileSdk
 
-apply plugin: 'com.google.gms.google-services'
\ No newline at end of file
+apply plugin: 'com.google.gms.google-services'

app/src/main/java/chat/rocket/android/helper/CrashlyticsTree.kt

@@ -6,7 +6,7 @@ import timber.log.Timber
 
 class CrashlyticsTree : Timber.Tree() {
 
-    override fun log(priority: Int, tag: String, message: String, throwable: Throwable?) {
+    override fun log(priority: Int, tag: String?, message: String?, throwable: Throwable?) {
         Crashlytics.log(priority, tag, message)
 
         if (throwable != null) {