Detect Ed25519 keys as well

Ed255519 keys generated by OpenSSH contain "BEGIN OPENSSH PRIVATE KEY"
as identifier. This commit adds coverage for such keys as well.

pre_commit_hooks/detect_private_key.py

diff --git a/pre_commit_hooks/detect_private_key.py b/pre_commit_hooks/detect_private_key.py
index 1a4f323..0c2eca4 100644
--- a/pre_commit_hooks/detect_private_key.py
+++ b/pre_commit_hooks/detect_private_key.py
@@ -7,6 +7,7 @@
     b'BEGIN RSA PRIVATE KEY',
     b'BEGIN DSA PRIVATE KEY',
     b'BEGIN EC PRIVATE KEY',
+    b'BEGIN OPENSSH PRIVATE KEY'
 ]
 
 

tests/detect_private_key_test.py

diff --git a/tests/detect_private_key_test.py b/tests/detect_private_key_test.py
index 4f2bb93..c6558ba 100644
--- a/tests/detect_private_key_test.py
+++ b/tests/detect_private_key_test.py
@@ -7,6 +7,7 @@
     (b'-----BEGIN RSA PRIVATE KEY-----', 1),
     (b'-----BEGIN DSA PRIVATE KEY-----', 1),
     (b'-----BEGIN EC PRIVATE KEY-----', 1),
+    (b'-----BEGIN OPENSSH PRIVATE KEY-----', 1),
     (b'ssh-rsa DATA', 0),
     (b'ssh-dsa DATA', 0),
     # Some arbitrary binary data