Merge pull request mozilla#519 from mozilla/add_ed25519_support

Add ed25519 and bcrypt_pbkdf per net-ssh#478

Merge pull request mozilla#505 from mozilla/bump_for_42

Bump for 42

Merge pull request mozilla#501 from mozilla/bump_for_41

Bump to 41

Merge pull request mozilla#488 from mozilla/bump_for_40

Bump for 40

Merge pull request mozilla#485 from mozilla/bump_for_39

Bump for 39

Merge pull request mozilla#480 from mozilla/add_yaml_output_support

Add YAML output support to ssh_scan binary

Merge pull request mozilla#475 from mozilla/bump_for_37

bump for 37

Merge pull request mozilla#442 from mozilla/bump_for_36

Bump version for 36

Merge pull request mozilla#436 from mozilla/bump_ci_rubies

Bump CI ruby versions

Merge pull request mozilla#434 from mozilla/bump_for_34

Bump for 34