Javaproperties-cli

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- Support Click 8

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- Support Python 3.9
- Drop support for Python 2.7 and 3.5
- Support `javaproperties` 0.8.\*

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- `properties2json` and `json2properties` now preserve the input ordering of
keys by default; use the new `--sort-keys` option to get the old behavior
- Drop support for Python 3.4
- Gave `javaproperties`' `get` and `select` subcommands `--quiet` options for
suppressing warnings about missing keys

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- Require `javaproperties` 0.7.\*

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- Require `javaproperties` 0.6.\*
- Use `'javapropertiesreplace'` error handler when opening output files
- Gave `javaproperties`' `format`, `select`, and `set` subcommands `--ascii`
and `--unicode` options for controlling the escaping of non-ASCII characters
in output
- Gave `properties2json` and `json2properties` `--ascii` and `--unicode`
options for controlling the escaping of non-ASCII characters in output
- `properties2json` now always outputs UTF-8
- By default, comments output by `json2properties` now have all non-ASCII
characters escaped rather than all non-Latin-1 characters

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- Include installation instructions, GitHub links, and changelog in the Read
the Docs site
- Gave `json2properties` a `--comment <comment>` option
- Support Python 3.8