[BUG] Notable breaks onSave of other Markdown extensions

[frudolph77]

Hey,

I've found an other bug.

Having Notable and Markdown All in One installed, the onSave hooks wont run anymore, e.g. the updating of a TOC.
I first thought it's an issue with Markdown All in One, but it isn't see yzhang-gh/vscode-markdown#1079 (comment)

Comparing both onSave hooks shows a slight difference. I change the onSave of Notable to the way of Markdown All in One and now they work together.

I'll push these change to #10 my local branch was somehow broken. I'll file a new PR.

kind regards
Frank