fix version bump script generates garbage files

scripts/bump-version.bash

@@ -31,14 +31,16 @@ if [[ ! "$version" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
     exit 1
 fi
 
-case "$OSTYPE" in
-    darwin*)
-        sed="/usr/bin/sed -i '' -E"
-        ;;
-    *)
-        sed="sed -i -E"
-        ;;
-esac
+function sed_() {
+    case "$OSTYPE" in
+        darwin*)
+            /usr/bin/sed -i '' -E "$@"
+            ;;
+        *)
+            sed -i -E "$@"
+            ;;
+    esac
+}
 
 pre_commit_hook='./.pre-commit-hooks.yaml'
 usage_doc='./docs/usage.md'
@@ -49,12 +51,12 @@ echo "Bumping up version to ${version} (tag: ${tag})"
 
 # Update container image tag in pre-commit hook (See #116 for more details)
 echo "Updating $pre_commit_hook"
-$sed "s/entry: docker.io\\/rhysd\\/actionlint:.*/entry: docker.io\\/rhysd\\/actionlint:${version}/" "$pre_commit_hook"
+sed_ "s/entry: docker\\.io\\/rhysd\\/actionlint:.*/entry: docker.io\\/rhysd\\/actionlint:${version}/" "$pre_commit_hook"
 
 echo "Updating $usage_doc"
-$sed "s/    rev: v[0-9]+\.[0-9]+\.[0-9]+/    rev: v${version}/" "$usage_doc"
-$sed "s/actionlint@[0-9]+\.[0-9]+\.[0-9]+/actionlint@${version}/g" "$usage_doc"
-$sed "s/\`actionlint:[0-9]+\.[0-9]+\.[0-9]+\`/\`actionlint:${version}\`/g" "$usage_doc"
+sed_ "s/    rev: v[0-9]+\.[0-9]+\.[0-9]+/    rev: v${version}/" "$usage_doc"
+sed_ "s/actionlint@[0-9]+\.[0-9]+\.[0-9]+/actionlint@${version}/g" "$usage_doc"
+sed_ "s/\`actionlint:[0-9]+\.[0-9]+\.[0-9]+\`/\`actionlint:${version}\`/g" "$usage_doc"
 
 echo 'Creating a version bump commit and a version tag'
 git add "$pre_commit_hook" "$usage_doc"