Trying to get two Trinket M0s to talk to each other

receiver.ino

char state[10];

void setup()
{
    Serial.begin(9600);
}

void loop()
{
    Serial.println("reading bytes");
    Serial.readBytes(state, 10);
    Serial.println(state);
    delay(1000);
}

sender.ino

char state[10] = "hello";

void setup()
{
    Serial.begin(9600);
}

void loop()
{
    Serial.write(state, 5);
    delay(1000);
}