Fix missing information in README.md

After following README.md instructions, I see the script failing because I didn't set WPA_PASSWORD:

```
$ sudo ./build.sh
WPA_PASSWORD must be between 8 and 63 characters
```
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Martin Joly 2020-01-07 23:58:35 +01:00 committed by GitHub
parent 024840034e
commit 154eb632a1
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@ -117,7 +117,7 @@ The following environment variables are supported:
Password for the first user Password for the first user
* `WPA_ESSID`, `WPA_PASSWORD` and `WPA_COUNTRY` (Default: unset) * `WPA_ESSID`, `WPA_PASSWORD` and `WPA_COUNTRY` (Default: unset, `WPA_PASSWORD` is **required** and should be of length 8-63)
If these are set, they are use to configure `wpa_supplicant.conf`, so that the raspberry pi can automatically connect to a wifi network on first boot. If `WPA_ESSID` is set and `WPA_PASSWORD` is unset an unprotected wifi network will be configured. If these are set, they are use to configure `wpa_supplicant.conf`, so that the raspberry pi can automatically connect to a wifi network on first boot. If `WPA_ESSID` is set and `WPA_PASSWORD` is unset an unprotected wifi network will be configured.