Update ERC721 to latest 1.11.0 from OpenZeppelin-solidity (#11)

* Update ERC721 to latest 1.11.0 from OpenZeppelin-solidity

* Hardcode supported interfaces instead of using lookup table. This avoids shifting storage when extending supports interface.

* Update build artifacts

* Fix linter errors

test/helpers/makeInterfaceId.js

@@ -0,0 +1,21 @@
+import { soliditySha3 } from 'web3-utils';
+
+const INTERFACE_ID_LENGTH = 4;
+
+export default (interfaces = []) => {
+  const interfaceIdBuffer = interfaces
+    .map(methodSignature => soliditySha3(methodSignature)) // keccak256
+    .map(h =>
+      Buffer
+        .from(h.substring(2), 'hex')
+        .slice(0, 4) // bytes4()
+    )
+    .reduce((memo, bytes) => {
+      for (let i = 0; i < INTERFACE_ID_LENGTH; i++) {
+        memo[i] = memo[i] ^ bytes[i]; // xor
+      }
+      return memo;
+    }, Buffer.alloc(INTERFACE_ID_LENGTH));
+
+  return `0x${interfaceIdBuffer.toString('hex')}`;
+};