Preserve spaces that are emphasized

[jgrams]

'Emphasis with no<em> </em>text<strong> preserves</strong> spaces.'

The result is this:
'Emphasis with notext **preserves** spaces.'

I think the text should be this:
'Emphasis with no text **preserves** spaces.'

[colinodell]

This looks great, thank you so much!

[colinodell]

Just released 4.6.2 with this fix https://github.com/thephpleague/html-to-markdown/releases/tag/4.6.2 🎉