Fix oneline log format in script/bump

script/bump

@@ -18,4 +18,4 @@ script/release
 echo "Ok! v$NEW_VERSION is released."
 echo "Please fill out the release: https://github.com/github/pages-gem/releases/tag/v$NEW_VERSION"
 echo "Here's the git history since the last release:"
-git log --one-line v$OLD_VERSION...v$NEW_VERSION
+git log --pretty=oneline v$OLD_VERSION...v$NEW_VERSION