Follow best practices with read command in deploy script

The valued advice provided by the ShellCheck shell script static analysis tool is:
https://github.com/koalaman/shellcheck/wiki/SC2162

> You should always use `-r` unless you have a good reason not to.

In order to achieve ShellCheck compliance, it is necessary to do one of the following:

- Add the `-r` flag to the `read` command.
- Add a ShellCheck directive to the script to disable rule SC2162 for this line.

In this particular application, `-r` is not necessary, but it also does no harm. So I think the first option is best.

Author: per1234

deploy.sh

@@ -19,7 +19,7 @@ mkdir distrib
 for folder in "${target_folders[@]}"
 do
 
-  IFS=_ read -a fields <<< "$folder"
+  IFS=_ read -r -a fields <<< "$folder"
   mkdir -p "distrib/${folder}/bin/"
   GOOS="${fields[0]}" GOARCH="${fields[1]}" go build -o "distrib/${folder}/bin/arduinoOTA" -ldflags "-X main.compileInfo=$COMPILEINFO" main.go
 done