Added marker condif to pytest.ini
diff --git a/pytest.ini b/pytest.ini
index f717693..9b44f19 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -9,4 +9,5 @@
pbkdf2hmac: this test requires a backend providing PBKDF2HMACBackend
rsa: this test requires a backend providing RSABackend
traditional_openssl_serialization: this test requires a backend providing TraditionalOpenSSLSerializationBackend
+ pkcs8_serialization: this test requires a backend providing PKCS8SerializationBackend
supported: parametrized test requiring only_if and skip_message