docs(readme): update

README.md

@@ -12,13 +12,13 @@ if err != nil {
 }
 ```
 
-# Why
+## Why
 * Using `Wrap` is the most explicit way to do error wrapping
 * Writing `fmt.Errorf("foo: %w", err)` is implicit, redundant and error-prone
 * Parsing of `"foo: %w"` is slow, implicit and redundant
 * The [pkg/errors](https://github.com/pkg/errors) and [xerrrors](https://pkg.go.dev/golang.org/x/xerrors) are not maintainted
 * The [cockroachdb/errors](https://github.com/cockroachdb/errors) is too big
 * The `errors` has no caller stack trace
 
-# Don't need traces?
+## Don't need traces?
 Call `errors.DisableTrace` or use build flag `noerrtrace`.