Encoded mail in magic link in url format

src/main/java/org/devcon/ticket/Issuer.java

@@ -1,5 +1,7 @@
 package org.devcon.ticket;
 
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 import org.tokenscript.attestation.core.AttestationCrypto;
 import org.tokenscript.attestation.core.DERUtility;
 import org.bouncycastle.asn1.ASN1InputStream;
@@ -58,7 +60,7 @@ public static void main(String... args) {
                 String ticketInUrl = new String(
                     Base64.getUrlEncoder().encode(ticket.getDerEncoding()));
                 System.out.printf("?ticket=%s&secret=%s&mail=%s", ticketInUrl,
-                    sharedSecret.toString(), mail);
+                    sharedSecret.toString(), URLEncoder.encode(mail, StandardCharsets.UTF_8));
             } catch (Exception e) {
                 System.err.println("Something went wrong. Please check the supplied arguments again and ensure that the private key is an elliptic curve key in RFC 5915 format.");
                 throw new RuntimeException("Could not produce magic link", e);