escape commit messages

[ThomasHappyHotel]

Topic
Escape commit messages to not break sed command.

Explaination
I have tried using change today at my repository. Unfortunately it was not fully possible because some old commit messages have the | character which breaks the sed command.

added 1.1.5 to CHANGELOG.md
sed: 7: "s|\(^## \[1.1.5\] -.*$\ ...": bad flag in substitute command: '?'
added 1.1.6 to CHANGELOG.md

added 1.18.5 to CHANGELOG.md
sed: 18: "s|\(^## \[1.18.5\] -.*$ ...": bad flag in substitute command: '|'
added 1.19.0 to CHANGELOG.md

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