Merge remote-tracking branch 'origin/master'

# Conflicts:
#	README.md

demos/bio/accept.cnf

@@ -5,9 +5,13 @@ Port = 4433
 # Protocol = ALL, -TLSv1.2
 # Only support 3 curves
 Curves = P-521:P-384:P-256
-# Automatic curve selection
-ECDHParameters = Automatic
 # Restricted signature algorithms
 SignatureAlgorithms = RSA+SHA512:ECDSA+SHA512 
 Certificate=server.pem
 PrivateKey=server.pem
+ChainCAFile=root.pem
+VerifyCAFile=root.pem
+
+# Request certificate
+VerifyMode=Request
+ClientCAFile=root.pem