Return PathBuf from Picture::to_pdf method (#30)

Merge pull request #27 from DJDuque/error

Improve error handling with the `thiserror` crate.
Simplify API to compile and visualize plots when the `tectonic` feature is not enabled.

Release v0.4.1 (#24)

Fix issue #18. (#19)

Bump to 0.3.1 (#17)

Upgrade to version 0.3 (#14)

* Add link to examples in README.md

* Bump to 0.3

Merge pull request #9 from DJDuque/tectonic

Add the `inclusive` feature