"INVALID URL" error for images with line break/irregular whitespace

[robole]

Hi,

Thanks for your efforts working on this package.

I am getting an "INVALID URL" error when I run vsce package. I tracked down what is triggering the error to the following snippet in the README.md of my extension:

<p align="center">
<img src="img/screenshots/demo.webp" width="556" height="482"
alt="recording of  exploring view opened from the command 'Snippets Ranger: Show me that dur Range, Partner'. An entry of 'Markdown snippets' from the table of contents is selected and clicked, it takes the user down to the table with the snippets displayed for that extension."/>
</p>

It appears that the issue was cause by a line break/whitespace.

Here are 2 consecutive commits for my extension with the substantive change to the README that enable successful packaging:

• Unsuccessful packaging: robole/vscode-snippets-ranger@3c9bde7
• Successful packaging: robole/vscode-snippets-ranger@cbc3d14

I am using VSCE version 2.1.5.

It also might be worthwhile including the URL in the error for tracking down the issue more easily. It was a bit of a wild goose chase for me to fix this!!!

[joaomoreno]

Thanks for the repro steps!