Update DBChooser library version 1.1 -> 1.2.1 (support arm64)

[kyungtaek]

Please update DBChooser Pod repo. for supporting arm64. Ver 1.1 -> 1.2.1

[varenc]

Hi kyungtaek,

Thanks for the contribution! did you make any modifications to the xcode project to recompile the binary? I'd like to be able to reproduce this myself and compare the binary with the one in this pull request.

[kyungtaek]

Hi Varenc,

I did not change it, but the latest version has been performed overwritten. Therefore, I think this will be equal to the latest version.

[thejeff77]

Please merge & update this framework

[greg-db]

@thejeff77 I see you also posted in issue #9, so I'll reply there.

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