[docs] readme badges

[StrikerRUS]

This PR reorders badges in more logical way and adds license badge.

[msftclas]

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[StrikerRUS]

@guolinke Do you see the empty place instead of the badge too?

[guolinke]

@StrikerRUS

[StrikerRUS]

@guolinke OK. I thought that it's problem of all users (like this one), but seems only mine.

Maybe it'll useful in the future: the easiest trick which works for me is adding ? at the end of the link to the image.