fix: create typings folder when it's missing

[Hotell]

Current behaviour:

Project structure:

- types/
  |- one/
  |- two/

When we wanna add new definitions:

npx dts-gen --dt --template module --name webpack-config-utils

we'll get following error, because webpack-config-utils folder doesn't exists:

Unexpected crash! Please log a bug with the commandline you specified.
ENOENT: no such file or directory, mkdir 'types/webpack-config-utils'

Expected:

It would be more user friendly to create the folder when it doesn't exist, ( mkdir -p like behaviour )

[Hotell]

whops ! looks like I was executing the command within types folder, my mistake!

Still it would be nice to provide some more specific error message :)

[DetachHead]

duplicate of #85