chore: fix sigpipe error for commit message

[devversion]

• When retrieving the last commit message, the script currently pipes it through the head command.

  Since the git log command using the less command will exit immediately the pipe will fail with a 141 exit code (because it can't read from a closed stream)

@jelbourn Sometimes Travis is not publishing the builds due to the mentioned sigpipe signal (which depends on the output of git log --oneline | head -n1).

Here is a snippet which demonstrates the issue
(set -e -o pipefail; test=$ (git log --oneline | head -n1); echo $test; echo $PIPESTATUS[$@])

[jelbourn]

LGTM

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