1) S13I and W152C positions added as critical because of https://science.sciencemag.org/content/early/2021/06/30/science.abi7994.full
### v18.0.0
1) S:K417N position added as critical because of https://www.reuters.com/business/healthcare-pharmaceuticals/what-is-delta-variant-coronavirus-with-k417n-mutation-2021-06-23/