use long forms of flags in pre-commit hook script

.githooks/pre-commit

@@ -1,8 +1,8 @@
 #!/bin/sh
-git diff --quiet --cached -- scripts && exit 0
-git diff --name-only -- scripts | grep -F "$(git diff --cached --name-only -- scripts)" && exit 1
-version="$(date -u +%Y.%m.%d.%H%M%S)"
+git diff --cached --quiet -- scripts && exit 0
+git diff --name-only -- scripts | grep --fixed-strings "$(git diff --cached --name-only -- scripts)" && exit 1
+version="$(date --utc +%Y.%m.%d.%H%M%S)"
 git diff --cached --name-only -- scripts | while read -r file; do
-	sed -i "s/@version .*/@version $version/" "$file"
+	sed --in-place "s/@version .*/@version $version/" "$file"
 	git add "$file"
 done