[ticket/12720] Allow commit heading to begin with lowercase letters

PHPBB3-12720
Merge pull request #2608 from dhruvgoel92/ticket/12720

[ticket/12720] Allow commit heading to begin with lowercase letters

* dhruvgoel92/ticket/12720:
  [ticket/12720] Allow commit heading to begin with lowercase letters
Merge branch 'develop-olympus' into develop-ascraeus

* develop-olympus:
  [ticket/12720] Allow commit heading to begin with lowercase letters
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12720] Allow commit heading to begin with lowercase letters