* Fix EC curve name typo in crypto_util
Fix typo of secp521r1 in crypto util module.
- secp521r1 is to be supported by certbot, but a typo of "SECP521R1" in the input validation section of the make_key function results in an error being thrown
* Add myself to authors.md
Add myself to authors.md ^^
* Add test for secp521r1 key generation
Add test for secp521r1 key generation to cli-tests
