algorithm typo

[be-a-panther]

There is a mismatch between:

private-search-set/private_search_set/main.py

Line 101 in 5f0f153

if self.algorithm == 'Blake2':

and

private-search-set/README.md

Line 56 in 5f0f153

|`algorithm`|`string`|Keyed-hash message authentication. Available:<br/> - Blake2b<br/> - Blake3<br/> - HMAC-SHA-256<br /> - HMAC-SHA-512 |&check;|

It should be blake2b or Blake2. I would prefer it lowercase and the naming like in python. Like the canonicalization-format.