Merge pull request #45 from zosocanuck/zosocanuck-patch-1

looping through chain will hit recursion limit since updated link is …

acme4j-client/src/main/java/org/shredzone/acme4j/Certificate.java

@@ -126,7 +126,7 @@ public class Certificate extends AcmeResource {
             URL link = chainCertUrl;
             while (link != null && certChain.size() < MAX_CHAIN_LENGTH) {
                 try (Connection conn = getSession().provider().connect()) {
-                    conn.sendRequest(chainCertUrl, getSession());
+                    conn.sendRequest(link, getSession());
                     conn.accept(HttpURLConnection.HTTP_OK);
 
                     certChain.add(conn.readCertificate());