Minor release fixing bugs, improving typings, adding some functionalities and porting example to RN 0.62.

New Features 🎉

• add customizing default back title by @WoLewicki (#458)
• add types for header views and back button visibility prop by @WoLewicki (#457)
• export ScreenStackHeaderCenterView by @kyle-ssg (#444)
• upgrade Example to RN 0.62 by @WoLewicki (#443)
• add RCTFont for expo-font integration by @WoLewicki (#442)

Bug Fixes 🐛

• fix fullScreenModal presentation behavior by @WoLewicki (#441)
• fix large header background when largeTitleBackgroundColor is not set by @janicduplessis (#435)

Other Changes 👍

• add new Software Mansion logo by @adamczyk777 (#440)

🙌 Thank you all for your contributions!