fourmolu 0.15.0.0

[BrewTestBot]

Created by brew bump

---

Created with brew bump-formula-pr.

release notes

* Add `single-deriving-parens` configuration option to determine if `deriving` clauses of a single type should be parenthesized ([#386](https://github.com/fourmolu/fourmolu/pull/386))

Fix the order in which the configurations are applied (#390)

Upstream changes:
Ormolu 0.7.4.0

Don't error when the JavaScriptFFI language pragma is present. Issue

1087.
Improve comment placement in if-then-else blocks. Issue

998.
Now command line options for fixity overrides and module re-exports

overwrite information from .ormolu files. Issue

1030.
Respect newlines in data declarations in more cases. Issue

1077 and issue

947.
The -d / --debug command line option now makes Ormolu print out debug

information regarding operator fixity inference. Issue

1060.

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