Allow BitPay address format for bitcoin cash

src/index.html

@@ -575,6 +575,16 @@
                 <div class="col-md-12">
                     <h2>Derived Addresses</h2>
                     <p>Note these addreses are derived from the BIP32 Extended Key</p>
+                </div>
+                <div class="col-md-12 use-bitpay-addresses-container hidden">
+                    <div class="checkbox">
+                        <label>
+                            <input type="checkbox" class="use-bitpay-addresses">
+                            <span>Use BitPay-style addresses for Bitcoin Cash (ie starting with 'C' instead of '1')</span>
+                        </label>
+                    </div>
+                </div>
+                <div class="col-md-12">
                     <table class="table table-striped">
                         <thead>
                             <th>