updating the README.rst and index.html files

Author: vivek-arte

README.rst

@@ -109,6 +109,7 @@ Index of ZIPs
     <tr> <td>225</td> <td class="left"><a href="zip-0225.rst">Version 5 Transaction Format</a></td> <td>Final</td>
     <tr> <td>226</td> <td class="left"><a href="zip-0226.rst">Transfer and Burn of Zcash Shielded Assets</a></td> <td>Draft</td>
     <tr> <td>227</td> <td class="left"><a href="zip-0227.rst">Issuance of Zcash Shielded Assets</a></td> <td>Draft</td>
+    <tr> <td>228</td> <td class="left"><a href="zip-0228.rst">Zcash Shielded Asset Swaps</a></td> <td>Draft</td>
     <tr> <td>230</td> <td class="left"><a href="zip-0230.rst">Version 6 Transaction Format</a></td> <td>Draft</td>
     <tr> <td>239</td> <td class="left"><a href="zip-0239.rst">Relay of Version 5 Transactions</a></td> <td>Final</td>
     <tr> <td>243</td> <td class="left"><a href="zip-0243.rst">Transaction Signature Validation for Sapling</a></td> <td>Final</td>

index.html

@@ -83,6 +83,7 @@
   <tr> <td>225</td> <td class="left"><a href="zip-0225">Version 5 Transaction Format</a></td> <td>Final</td>
   <tr> <td>226</td> <td class="left"><a href="zip-0226">Transfer and Burn of Zcash Shielded Assets</a></td> <td>Draft</td>
   <tr> <td>227</td> <td class="left"><a href="zip-0227">Issuance of Zcash Shielded Assets</a></td> <td>Draft</td>
+  <tr> <td>228</td> <td class="left"><a href="zip-0228">Zcash Shielded Asset Swaps</a></td> <td>Draft</td>
   <tr> <td>230</td> <td class="left"><a href="zip-0230">Version 6 Transaction Format</a></td> <td>Draft</td>
   <tr> <td>239</td> <td class="left"><a href="zip-0239">Relay of Version 5 Transactions</a></td> <td>Final</td>
   <tr> <td>243</td> <td class="left"><a href="zip-0243">Transaction Signature Validation for Sapling</a></td> <td>Final</td>