conventional-changelog-conventionalcommits: Patch version headings shouldn’t be a different size

Same as #214, but for conventional-changelog-conventionalcommits. Heading levels indicate a structure. Patch versions should use ## <small> instead of ### , as @marcysutton pointed out.

[languitar]

Actually, the whole idea of using higher-level headings for major releases is a bit strange here, because a heading in a text document is meant for what follow below. However, with the reverse sorting, the structure created here puts the previous releases into the section created by the next version, e.g.:

## 2.1.0

# 2.0.0

## 1.5.18

## 1.5.17

Why are 1.5.17 and 1.5.18 part of the section opened by the 2.0.0 heading. That doesn’t make any sense with this sorting.

[chalkygames123]

Thank you all. I’ve been waiting for this fix!