feat(v4.1.4): full spread trading support

examples/apidoc/V5/Spread-Trading/get-spread-tickers.js

@@ -0,0 +1,16 @@
+const { RestClientV5 } = require('bybit-api');
+
+const client = new RestClientV5({
+  testnet: true,
+});
+
+client
+  .getSpreadTickers({
+    symbol: 'SOLUSDT_SOL/USDT',
+  })
+  .then((response) => {
+    console.log(response);
+  })
+  .catch((error) => {
+    console.error(error);
+  });