adjust to latest API

src/main/java/org/cryptomator/common/keychain/KeychainManager.java

@@ -38,6 +38,11 @@ public class KeychainManager implements KeychainAccessProvider {
 		return result;
 	}
 
+	@Override
+	public String displayName() {
+		return getClass().getName();
+	}
+
 	@Override
 	public void storePassphrase(String key, CharSequence passphrase) throws KeychainAccessException {
 		getKeychainOrFail().storePassphrase(key, passphrase);

src/test/java/org/cryptomator/common/keychain/MapKeychainAccess.java

@@ -14,6 +14,11 @@ class MapKeychainAccess implements KeychainAccessProvider {
 
 	private final Map<String, char[]> map = new HashMap<>();
 
+	@Override
+	public String displayName() {
+		return getClass().getName();
+	}
+
 	@Override
 	public void storePassphrase(String key, CharSequence passphrase) {
 		char[] pw = new char[passphrase.length()];