Timeout too short on startup without EN pin

[boraozgen]

Hello,

I am using a ESP32-WROOM-32 module on my board without the EN pin connection. On startup, I receive "ready" from the module, but then the library sends "AT+RST" and waits too short before going into timeout. I looked into it and in the case where EN pin is not connected, the timeout is set to 100ms, which is obviously too short:

esp32-driver/ESP32/ESP32.cpp

Line 200 in b143641

setTimeout(100);

Setting it to 500ms fixes the issue. I can open PR if you approve the change.