Reference style image after inline style image doesn't work correctely

[ye-will]

failed:

![sd-inline](https://raw.githubusercontent.com/showdownjs/logo/master/dist/logo.readme.png) ![sd-ref][sd-logo]

ok:

![sd-ref][sd-logo] ![sd-inline](https://raw.githubusercontent.com/showdownjs/logo/master/dist/logo.readme.png)

[tivie]

@ye-will Verified and reproducible. I will look into it as soon as possible

demo

[tivie]

@ye-will should be fixed now in 73206b0, develop branch

[ye-will]

@tivie nice work.