Revert "remove beta tag"
Revert "remove beta tag"

This reverts commit ae4c0edd74957f4f9840006952c20af661956fa5.

Conflicts:
	README.md

ChannelMeter/stripe-go,collinglass/stripe-go,dominicphillips/stripe-go,ChannelMeter/stripe-go,mondough/stripe-go,shazow/stripe-go,gcnonato/stripe-go,hyperworks/stripe-go,BearchInc/stripe-go,mondough/stripe-go,ryanlower/stripe-go,stripe/stripe-go,dominicphillips/stripe-go,froatsnook/stripe-go,getbread/stripe-go,stripe/stripe-go,froatsnook/stripe-go