Wrong markdown header level for date in generated CHANGELOG

[RaschidJFR]

Describe the bug
Date header should have an <h2> level instead of <h3> (removing one #in markdown). This is quiet trivial but it helps going through the changelog in a markdown/html visualizer that allows collapsing sections.

Current behavior
Date header is generated with as h3:

### 0.0.1 (2020-09-21)

Expected behavior
Should be generated as h2:

## 0.0.1 (2020-09-21)

Environment

• standard-version version(s): 9.0.0

[NateScarlet]

Duplicate of #317

[landwire]

Is this fixed yet?

[damlys]

Looks like it was fixed in 9.2.0 and broken again in 9.3.1. Look at project's changelog 😛

https://github.com/conventional-changelog/standard-version/blob/ca5ab8fb3bad6695e8571752cfdf46e243cea69e/CHANGELOG.md

[RaschidJFR]

I'm closing this as a dup of #317 , there seems to be far more activity on that other thread.