Wikitext headings to markdown

Convert the wikitext headings to markdown.

Input

= First, a heading =
== Section ==
=== Deeper ===

As you can see, the headings have equals signs like =
in all kinds of funny places.

== Dets ==
Why not = this here.

```
var = 4

def funcy(min=1, max=2):
  return (min + max) / 2
```

=== Also ===
Please note.  Thanks.

Output

# First, a heading
## Section
### Deeper

As you can see, the headings have equals signs like =
in all kinds of funny places.

## Dets
Why not = this here.

```
var = 4

def funcy(min=1, max=2):
  return (min + max) / 2
```

### Also
Please note.  Thanks.