bugfix: define more subpacket features

[janmojzis]

PGPy parses the "subpacket features" entry incorrectly.
It only accepts the variant "0x01" ModificationDetection.
This pull request fixes the problem.

[janmojzis]

How to reproduce the bug:

import sys
import pgpy
import difflib

orig = '''-----BEGIN PGP PUBLIC KEY BLOCK-----

mQENBGGTvTQBCAC6ey144n7CG8foafF6mwgIBN1fIm1ILZDuGS4tMr0/XI8pgJnT
QvsPxZWEvtSm7bEMObzEoZJcXwjBcJl1B0ui8k5kHMTI75gCmZPsoKLFWIEpuRBQ
PBocusw80apDmLnNDQLVQvDFtEua5gaNa/fRw9YsmBoXBqvgrjFUIdGyWoQvH5+a
9OYlWD9n5VV0gnVMb+aclwVzB/zJw3kHGSgzuMtlAHeQiah7Y8yomQn/UIX8yqDf
+11sP3+c87YcjkRqImRTtmKEDcEtGPAIXC6SYA+uEEkbYE0Fy0chkvtnVWJ597fa
Epai4rnICU8zoJ6X5z3v1aM2WerhX9oq9X8PABEBAAG0QEFkb3B0aXVtIEdQRyBL
ZXkgKERFQi9SUE0gU2lnbmluZyBLZXkpIDx0ZW11cmluLWRldkBlY2xpcHNlLm9y
Zz6JAVIEEwEIADwWIQQ7BNdTyQUNml00PzmEPEilZfjwSwUCYZO9NAIbAwULCQgH
AgMiAgEGFQoJCAsCBBYCAwECHgcCF4AACgkQhDxIpWX48Et4AggAjjJzYWuKV3nG
7ngInngl8G/m9JoHr7BmwgcQXYhdy5hVkMcUx5JLeXz2LMBUH/F2nD595hgjMabk
kVib20X8lq9RsNbdfc2hBcWU6qyHKxsIqT4boI2/XDyEzzMyyZWWNGo/27Ci7Xmj
pWu31nh0pDdPqdyWDIKojbVVnxlCRY8as8Sm+1ufi709KCi4MuwHNsUlCSwb/fju
NKeHkrHbLcHKUUIEcmTSKRWrpMYBzm1HYOGBz4xPuELwUfUp71ehfoyBZlp6RDRf
l5TYI1FmCyHuvjNhrJgWv7bOTcf8yObGY+TEUhzc4xQqCrF4ur9d3opvsuPBQsv+
Klqi5KSZgrkBDQRhk700AQgAq14okly8cFrpYVenEQPiB75AUZfKRpMduiR6IxAj
SKcH7aSoFZ9AubUEBVpZsyT5svxoEPe1i4TdbF+m9FGy42EcOlLa3ArLTj5H8FRl
UdGZB9I5mk4GptOzPM+aHMMu92vW/ZwjuS8DvOiQSp+cUmG1EqOMJSM7e/4BM71z
E+OKaVJCj79pEzhG3SK/IC/OlxxyETT66NSfYJd7Sw5R6Vr19am/uNU690W0CJ+q
VQeFpmDMr7LnfdFRIh+lJe05+PvWXeidkGjox5cbG52wf8aRIR/FgkfcFvqRMN1f
B+dVOWueloUeVAnzcUznOKmUEs7LP9ObJhYHHgup4IAU2wARAQABiQE2BBgBCAAg
FiEEOwTXU8kFDZpdND85hDxIpWX48EsFAmGTvTQCGwwACgkQhDxIpWX48EvXHQf/
Q0nZsGDXnZHiBoojeSdpkO7WBjMIP3w1GdLvRpPQrS8TfOPbZuoevzCNh38Y3gwF
yelJspvzDQrBXhgkzAGlucYg8Y7KHa5Ebm7iDgMzc37L1hYSZTYCqwd7aowfgy34
hOk3B67LffkJpIh738Oa9CtlwxQ9xcytmBmQ1fBBOwm/9IhAwHPQuydYIs4DxWbj
0MGSP4fDntU7e4UjsHNmhudDcYol0FaqdHHIIB9C/G4CzetRwHFOn3b4JwXMU7YU
6aJA3mXhi3hggMC3wkT2HHZ/TquuOdNc02fypWOCDOHz0alBBJNqoVUNFNqU3tfJ
wI4qF/KKq9BfyfucAs0ykA==
=szki
-----END PGP PUBLIC KEY BLOCK-----
'''

key, _ = pgpy.PGPKey.from_blob(orig)

for line in difflib.unified_diff(orig.split('\n'), str(key).split('\n')):
    print(line)

output:

--- 

+++ 

@@ -8,7 +8,7 @@

 Epai4rnICU8zoJ6X5z3v1aM2WerhX9oq9X8PABEBAAG0QEFkb3B0aXVtIEdQRyBL
 ZXkgKERFQi9SUE0gU2lnbmluZyBLZXkpIDx0ZW11cmluLWRldkBlY2xpcHNlLm9y
 Zz6JAVIEEwEIADwWIQQ7BNdTyQUNml00PzmEPEilZfjwSwUCYZO9NAIbAwULCQgH
-AgMiAgEGFQoJCAsCBBYCAwECHgcCF4AACgkQhDxIpWX48Et4AggAjjJzYWuKV3nG
+AgMiAgEGFQoJCAsCBBYCAwECHgECF4AACgkQhDxIpWX48Et4AggAjjJzYWuKV3nG
 7ngInngl8G/m9JoHr7BmwgcQXYhdy5hVkMcUx5JLeXz2LMBUH/F2nD595hgjMabk
 kVib20X8lq9RsNbdfc2hBcWU6qyHKxsIqT4boI2/XDyEzzMyyZWWNGo/27Ci7Xmj
 pWu31nh0pDdPqdyWDIKojbVVnxlCRY8as8Sm+1ufi709KCi4MuwHNsUlCSwb/fju
@@ -27,6 +27,6 @@

 0MGSP4fDntU7e4UjsHNmhudDcYol0FaqdHHIIB9C/G4CzetRwHFOn3b4JwXMU7YU
 6aJA3mXhi3hggMC3wkT2HHZ/TquuOdNc02fypWOCDOHz0alBBJNqoVUNFNqU3tfJ
 wI4qF/KKq9BfyfucAs0ykA==
-=szki
+=Wrjm
 -----END PGP PUBLIC KEY BLOCK-----

[janmojzis]

the public key is downloaded from: https://packages.adoptium.net/artifactory/api/gpg/key/public