Reverse dependencies for blake2b

Latest version of the following gems require blake2b

Gem Version
substrate_common.rb +21.7 Thousand Downloads 0.1.10

December 30, 2020

sr25519 +11.9 Thousand Downloads 0.8.0

October 26, 2021

nano-wallet +7.85 Thousand Downloads 0.2.0

August 01, 2018

nanocurrency +7.66 Thousand Downloads 0.2.1

June 02, 2019

utreexo +5.33 Thousand Downloads 0.2.0

July 02, 2019