ACME spec compatibility notice

index.html

@@ -59,7 +59,10 @@
             <label><input name="acme-api-type" type="radio" value="staging-v02" required>
               Testing</label>
             <input id="js-acme-api-url" type="url" placeholder="ACME directory url">
+            <br>
+            API Compatibility: Let's Encrypt v2 / ACME draft 15
             <div>
+              <br>
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