Fix ktlint (#159)

* Suppress logs for ktlint

Recent versions of ktlint (mine's 0.48.2) have started including logs
in their output when the `--stdin` flag is given. These logs would end
up being included *into the file* by apheleia, which isn't what we
want.

Since emitting log messages is likely never a good idea when
formatting code, I just opted to disable them altogether using a
command line flag. This fixes the issue.

* Add change log message about ktlint fix

CHANGELOG.md

@@ -3,6 +3,12 @@
 All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog].
 
+## Unreleased
+### Bugs fixed
+* `ktlint` would emit log messages into its stdout when formatting,
+  and these would get spliced into the source file. This has been fixed
+  by suppressing all logs from `ktlint`.
+
 ## 3.2 (released 2023-02-25)
 ### Features
 * You can use `apheleia-inhibit` as a file-local variable to disable

apheleia.el

@@ -961,7 +961,7 @@ being run, for diagnostic purposes."
     (google-java-format . ("google-java-format" "-"))
     (isort . ("isort" "-"))
     (lisp-indent . apheleia-indent-lisp-buffer)
-    (ktlint . ("ktlint" "--stdin" "-F"))
+    (ktlint . ("ktlint" "--log-level=none" "--stdin" "-F"))
     (latexindent . ("latexindent" "--logfile=/dev/null"))
     (mix-format . ("mix" "format" "-"))
     (nixfmt . ("nixfmt"))