Bump com.google.firebase:firebase-crashlytics from 18.4.0 to 18.6.0

Bumps [com.google.firebase:firebase-crashlytics](https://github.com/firebase/firebase-android-sdk) from 18.4.0 to 18.6.0.
- [Changelog](https://github.com/firebase/firebase-android-sdk/blob/master/docs/make_release_notes.py)
- [Commits](https://github.com/firebase/firebase-android-sdk/commits)

---
updated-dependencies:
- dependency-name: com.google.firebase:firebase-crashlytics
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Smodr/build.gradle

@@ -88,7 +88,7 @@ dependencies {
     annotationProcessor 'com.tickaroo.tikxml:processor:0.8.13'
     implementation 'com.google.firebase:firebase-core:21.1.1'
     implementation 'com.google.firebase:firebase-analytics:21.5.0'
-    implementation 'com.google.firebase:firebase-crashlytics:18.4.0'
+    implementation 'com.google.firebase:firebase-crashlytics:18.6.0'
     api 'com.google.firebase:firebase-crash:16.2.1'
     api 'com.google.android.gms:play-services-measurement-base:21.3.0'
     api 'com.google.firebase:firebase-appindexing:20.0.0'