feat: bump version

Author: carlosala

docs/pages/providers/ws.md

@@ -17,6 +17,7 @@ interface GetWsProvider {
       onStatusChanged: (status: StatusChange) => void
       innerEnhancer: (input: JsonRpcProvider) => JsonRpcProvider
       timeout: number
+      heartbeatTimeout: number
       websocketClass: WebSocketClass
     }>,
   ): WsJsonRpcProvider
@@ -87,6 +88,12 @@ class WSForPapi extends WebSocket {
 const provider = getWsProvider("wss://myws.com", { websocketClass: WSForPapi })
 ```
 
+## Heartbeat
+
+The provider will try to figure out if the ws connection became stale, and it needs to be closed and reopened to continue working.
+
+PAPI uses the heartbeat feature to accomplish this purpose. You can customize the heartbeat timeout with `heartbeatTimeout` option (in milliseconds). Its default is `40_000`.
+
 ## Connection status
 
 The provider also has a `getStatus` method that returns the current status of the connection. Let's see it:

vocs.config.tsx

@@ -1,6 +1,6 @@
 import { defineConfig } from "vocs"
 
-const version = "1.19.0"
+const version = "1.20.0"
 
 export default defineConfig({
   title: "Polkadot-API",