Update error message in convert.components
Update error message in convert.components

The `convert.components` only accepts a dict, but in the error message said that it accepts a string too.
ambrozic/google-maps-services-python,Scronker/google-maps-services-python,stephenmcd/google-maps-services-python,edwardsamuel/google-maps-services-python,googlemaps/google-maps-services-python,cmontezano/google-maps-services-python,codeAshu/google-maps-services-python,garydonovan/google-maps-services-python,Prindle19/google-maps-services-python