Document a limitation in user-provided BCrypt salts
requested to merge topic/Brian-Helba/document-a-limitation-in-userprovided-bc-1580157807502/bitbucket-pr-11 into branch/default
Created originally on Bitbucket by Anonymous
Document a limitation in user-provided BCrypt salts
This will allow users to construct salts which do not cause warnings. See https://bitbucket.org/ecollins/passlib/issues/25 for more context on the limitation.