update CI badge URL (badges/shields#8671)

README.md

@@ -11,7 +11,7 @@ We aim at developer-friendliness. `mcpyrate` yields correct [coverage](https://g
 
 We use [semantic versioning](https://semver.org/). `mcpyrate` is almost-but-not-quite compatible with `mcpy` 2.0.0, hence the initial release is 3.0.0. There are some differences in the named parameters the expander provides to the macro functions; for details, search [the main user manual](doc/main.md) for *differences to mcpy*.
 
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