Commit messages should be stripped of surrounding whitespace

[ThiefMaster]

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When enabling Squash+Merge for this PR, I believe I accidentally had a whitespace at the beginning of my commit message.

One would expect this to be stripped, since it makes absolutely no sense to have leading or trailing whitespace on commit messages. Unfortunately this was not the case, so I ended up with a commit in my master branch that had a leading whitespace on its first line.

Since this looked completely awful on command-line git, it required me to force-push master to get rid of it.

Please trim whitespace on either side of commit messages written on the GitHub UI.

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