Merge #613

613: export more proj types r=michaelkirk a=jdroenner

- [x] I agree to follow the project's [code of conduct](https://github.com/georust/geo/blob/master/CODE_OF_CONDUCT.md).
- [ ] I added an entry to `CHANGES.md` if knowledge of this change could be valuable to users.
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Co-authored-by: Johannes Drönner <droenner@informatik.uni-marburg.de>

geo/src/algorithm/proj.rs

@@ -1 +1 @@
-pub use proj::Proj;
+pub use proj::{Area, Info, Proj, ProjBuilder, ProjError, Projinfo};