RangeError: toString() radix argument must be between 2 and 36

[vervallsweg]

vervallsweg/cast-web-api-cli#6

`/home/pi/node_modules/mdns-cast-browser/cast-browser.js:57

buffer = buffer.toString('utf8');

Since this method defaults to utf-8 anyway, we can just drop this. Then the method should work on buffers and integers.