fix default socket options for mcp230xxi so socket name only need include the word 'interrupt'

src/mcp230xxi.js

@@ -24,7 +24,7 @@ class MCP230XXi extends MCP230XX {
     }
     // set the required interrupt consumer to the default options if none supplied
     if (!opts.sockets) opts.sockets = [ interrupt ]
-    else  if (!opts.sockets.find(socket=>socket.name==='interrupt')) {
+    else  if (!opts.sockets.find(socket=>socket.name.includes('interrupt'))) {
       opts.sockets.push(interrupt)
     }
     super(opts)