Update README.md

[Jookus]

I think there is a small numbering mistake ;)

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[Jookus]

I signed it!

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CLAs look good, thanks!

[abdonrd]

The README is automatically generated from the comments in the iron-flex-layout.html file.

Edit this file, and the readme bot will duplicate them over here! :)

[Jookus]

Okay thank you, but in that file this "mistake" is already fixed?!

[abdonrd]

@Jookus right...

@azakus @rictic @justinfagnani maybe can help with it. I think that they works in Tedium.

[dfreedm]

This looks like a bug in tedium, since it is numbered correctly here: https://github.com/PolymerElements/iron-flex-layout/blob/master/iron-flex-layout.html#L32

[rictic]

Tedium will change all numbers to 1., but that shouldn't affect the rendered form. The underlying issue is that the indentation isn't quite right. #84 should fix.