spaces before image-tag

[chmich]

dear all,

a very very little hint:

Redmine 4.0.4 FireFox 69.0.1, on Windows

if a space is before the first char of !screenshot_1_1571817680.png!, then it does not render the image.

i removed the space and it ran.

this is a little thing, but it may cause irritations. maybe this logic could be implemented in the gem

thanks for this very useful gem! Chris