Geobr

Launch of `geobr` v1.0 on [CRAN](https://cran.r-project.org/web/packages/geobr/index.html), including the following functions/datasets

* `read_country`
* `read_region`
* `read_state`
* `read_meso_region`
* `read_micro_region`
* `read_municipality`
* `read_weighting_area`
* `read_census_tract`
* `read_statistical_grid`
* `read_health_facilities`

* New data weighting areas (áreas de ponderação) of Brazilian 2010 Census
** New function read_weighting_area()

* New data: historical shapes of states and municipaltieies from 1872 to 1991
* New data: geolocated data of health facilities