4.1.8

• Fix webview crash: https://github.com/intercom/intercom-android/issues/456
• Fix broken lightbox transitions: https://github.com/intercom/intercom-android/issues/464
• Fix launcher and in-app notifications showing on Intercom Messenger screens
• Update Play Services & Firebase libraries to 11.8.0
• Update Glide to 4.4.0
• Updated Okio & OkHttp to latest versions