upcoming breaking change: dropping support for Racket 6.3 & 6.4 & 6.5 #80

I’m migrating from Travis CI to GitHub Actions for automated testing (using setup-racket). As a consequence, it seems likely that I’ll need to drop support for Racket 6.3 and 6.4, released in November 2015 and February 2016, respectively.

The last time I dropped support for Racket versions was the Pollen 2.0 release, where I dropped 6.0, 6.1, and 6.2 (then 4 years old).

Thanks to @bogdanp for the setup-racket package.

I’m migrating from Travis CI to GitHub Actions for automated testing (using [setup-racket](https://github.com/Bogdanp/setup-racket)). As a consequence, it seems likely that I’ll need to drop support for Racket 6.3 and 6.4, released in November 2015 and February 2016, respectively. The last time I dropped support for Racket versions was the [Pollen 2.0 release](https://github.com/mbutterick/pollen/commit/328b4d85e72d4953fedd4c001bc00a86f8060e4a), where I dropped 6.0, 6.1, and 6.2 (then 4 years old). Thanks to @bogdanp for the `setup-racket` package.

And Racket 6.5, released in April 2016.

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upcoming breaking change: dropping support for Racket 6.3 & 6.4 & 6.5 #80