Regression: readme no longer shows command title #267

Summary

Prior to version 1.24.0, a generated README.md file contained the "title" of each command (actually the first line of the description field). Now it no longer contains the title.

Expected behavior

For example, in my project prior to upgrading to dev-cli 1.24.0, an excerpt from my README.md looked like this:

## `adapt autocomplete [SHELL]`

display autocomplete installation instructions

```
USAGE
  $ adapt autocomplete [SHELL]

Actual behavior

After upgrading to 1.24.0, it looks like this:

## `adapt autocomplete [SHELL]`

```
USAGE
  $ adapt autocomplete [SHELL]

Additional information

This appears to be a regression caused by #141, which removed title from renderCommand.