v0.15.0 (2025-10-06)

Changes from v0.14 (2020-05-05):
- Add Fortran support.
- Switch to semver. Cleanup homebrew/npm package files.
- Add `--version` and `--clear-cache` flags. Improve help formatting.
- Case-insensitive file extension matching.
- Exit code 4 if final compilation does not produce a binary.

This one might be a little unstable... there's a couple of ambitious fixes.
Anyways, all the previous tests pass correctly as well as the new ones.

Fixes:
* now works in directories with spaces
* now compiles files with spaces

Breaking changes:
* no longer accepting stdin input for source code.

E.g., this no longer works:
```shell
$ cat hello.c | c
...or...
$ c < hello.c
```

In the three years that I've used this script, I've maybe used this
feature two times. I think that it's much more useful for a C program
to able to accept stdin input, than for this feature to exist.