From 3b191042847318ad87f2292fea7a0afd24729100 Mon Sep 17 00:00:00 2001
From: Alex Stokes <r.alex.stokes@gmail.com>
Date: Wed, 14 Aug 2019 09:25:54 -0700
Subject: [PATCH] Add missing `ABC` declaration following PR feedback in #240.

---
 libp2p/crypto/keys.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libp2p/crypto/keys.py b/libp2p/crypto/keys.py
index 97517058..9ee6b4c0 100644
--- a/libp2p/crypto/keys.py
+++ b/libp2p/crypto/keys.py
@@ -13,7 +13,7 @@ class KeyType(Enum):
     ECDSA = 3
 
 
-class Key:
+class Key(ABC):
     """
     A ``Key`` represents a cryptographic key.
     """