Jiren

* Get a version from the package metadata (9) speg03
* Use github-actions instead of travis-ci (8) speg03

* Update dependencies (7)

* Add strict option (6)

* Add program arguments to read a template from a file (3)
* Fix an error if the template does not contain variables (4)
* Refine code and docs (5)

* Filter None value variables (2)
* Revise tests (1)

First release!!