Python-opendata-transport

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- Chain errors to be more transparent to the error source (thanks miaucl)
- Add KeyError exception (thanks miaucl)
- Add line numbers (thanks polgarc)

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- Add support locations API (thanks miaucl)
- Add missing connections parameters (thanks miaucl)
- Add missing stationboard parameters (thanks miaucl)
- Add "True" flag for correct formatting of lists (ex. via parameter `via[]=foo1&via[]=foo2`) (thanks miaucl)

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- Don't use async timeout (thanks agners)
- Remove loop

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- Only allow aiohttp >= 3.7.4 to avoid CVE-2021-21330

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- Fix lib name

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- Stationboard support (Thanks agners)
- Various improvements (Thanks agners)
- Adding delay to response (Thanks cwilhelm)