Release PyET v1.3.0

What's Changed

• Add method for calculating Makkink reference evaporation same as KNMI by @martinvonk in #49
• Add code of conduct by @raoulcollenteur in #62
• Update issue templates by @raoulcollenteur in #61
• Create pull_request_template.md by @raoulcollenteur in #66
• Update project files to new Python package standards by @raoulcollenteur in #65
• Start using Github Actions for CI by @raoulcollenteur in #56
• Update README.md by @raoulcollenteur in #63
• Update master to pyet 1.3 by @raoulcollenteur in #69

New Contributors

• @martinvonk made their first contribution in #49

Full Changelog: v.1.2.2...v1.3.0