fix(commitlint): Parse breaking change headers correctly

Before this change, using a header like "fix!: Something" caused the
following commitlint errors:

✖   subject may not be empty [subject-empty]
✖   type may not be empty [type-empty]

It seems that the default header pattern does not recognize the
exclamation mark. To fix this, use the parser options from the
"conventional-changelog-conventionalcommits" template [1]. Using the
package as a parser preset would require that the NPM package is
installed, therfore copy the values from [2] instead.

[1]: https://github.com/conventional-changelog/conventional-changelog/tree/master/packages/conventional-changelog-conventionalcommits
[2]: https://github.com/conventional-changelog/conventional-changelog/blob/bfe3bf1c49d4a125474b398b2d304749fd3b56c7/packages/conventional-changelog-conventionalcommits/parser-opts.js

Signed-off-by: Martin Nonnenmacher <martin.nonnenmacher@bosch.io>

Author: mnonnenmacher

.commitlintrc.yml

@@ -1,6 +1,14 @@
 # Commitlint configuration.
 # See: https://github.com/conventional-changelog/commitlint/blob/master/docs/reference-rules.md
 ---
+parserPreset:
+  parserOpts:
+    headerPattern: '^(\w*)(?:\((.*)\))?!?: (.*)$'
+    breakingHeaderPattern: '^(\w*)(?:\((.*)\))?!: (.*)$'
+    headerCorrespondence: ['type', 'scope', 'subject']
+    noteKeywords: ['BREAKING CHANGE', 'BREAKING-CHANGE']
+    revertPattern: '/^(?:Revert|revert:)\s"?([\s\S]+?)"?\s*This reverts commit (\w*)\./i'
+    revertCorrespondence: ['header', 'hash']
 rules:
   body-leading-blank:
     - 2