Closes #144 - add check for listeners not supported in earlier SDK versions
Closes #144 - add check for listeners not supported in earlier SDK versions

dapriett/nativescript-google-maps-sdk,dapriett/nativescript-google-maps-sdk,dapriett/nativescript-google-maps-sdk,dapriett/nativescript-google-maps-sdk,dapriett/nativescript-google-maps-sdk