Clean library, RN 0.60+ support, removed Icons

This release removed all the additional options from props and uses only the default option:
RNToasty.Normal({ title: 'Hello toast });

in this repo Example folder was removed, also react-native-vector-icons dependency

if you need a simple Toast use this lib, otherwise use the original one with icons and extra customizations https://github.com/prscX/react-native-toasty