Updated styles to align buttons and gifs containers

[devautor]

I am working with two and three columns layout and the defaults works beautifully. Have updated a few of the styles with EDIT markers in corresponding comments in order to fix:

• input box should fill whole space, after placing provider logo
• type buttons should not be stretched vertically
• horizontal margin should be present between buttons only, and not on their end-sides
• there should be no right margin for last image column

P.S. Thanks again for creating and working on this library ::)

[Thanasis1101]

@devautor The fixes are now public in version 1.2.1 !
I saw your changes and fixed a couple things:

• When there were no numOfColumns (horizontal view), there were no right margins for any gif. So I added a check for horizontal or not.
• I found the width:'25%' very small so I changed it to a default of 35% and I added the property providerLogoStyle so that you can set it like this providerLogoStyle={{width:'40%'}}

I also gave you credits in the Version History section of the README.md.

I am glad that you find the package useful and thank you very much for helping improve it !