1.5.6

What's Changed

• Move license attribute to pyproject.toml. This is the new pip convention https://packaging.python.org/en/latest/guides/distributing-packages-using-setuptools/#license-metadata. Also remove the tag for Python 2 as we no longer test for Py2 and it likely doesn't work well anymore. by @copybara-service[bot] in #244
• Make the generated SQL compatible with more SQL engines. The problem is that in some SQL engines like MySQL string literals should be enclosed in single quotes, instead of double quotes. by @copybara-service[bot] in #246
• Change dropna default to True for Nth metric. by @copybara-service[bot] in #248
• Generalize the sql dialect to be configurable. This allows Meterstick to be used with other SQL dialects than GoogleSQL, which is requested in #245. Tested in https://colab.research.google.com/drive/1y3UigzEby1anMM3-vXocBx7V8LVblIAp?usp=sharing by @copybara-service[bot] in #247

Full Changelog: 1.5.5...1.5.6