Signed and stable version v1.0.4

This version currently includes

1. Optimized csidh implementation (still in python but faster than before);
2. ⚠️ Warning comment concerning the Castryck-Decru attack

In summary, sidh, sike, bsidh, and bsike implementations are no longer secure (it could be in the future, some countermeasure appears).

Signed and stable version v1.0.3

This version currently includes

• Diffie-Helman (DH) based protocols: sidh, csidh, and bsidh

• Key encapsulation mechanism (KEM): sike, and bsike

Notice, DH version must use only for ephemeral-ephemeral keys. bsike currently (and only) handles security as sikep434.