Protect variables from globbing and word splitting in deploy script

Stinginess with quoting in shell scripts is the most common cause of confusing bugs that usually only occur under
specific uncommon conditions. For this reason, all variables must be quoted.

More information:
https://github.com/koalaman/shellcheck/wiki/SC2086

Author: per1234

deploy.sh

@@ -1,7 +1,7 @@
 #!/bin/bash -xe
 GIT_REV="$(git log --pretty=format:'%h' -n 1)"
 BUILD_DATE="$(date +%Y-%m-%d:%H:%M:%S)"
-COMPILEINFO="$(echo +$GIT_REV+$BUILD_DATE | tr -d '"')"
+COMPILEINFO="$(echo "+${GIT_REV}+${BUILD_DATE}" | tr -d '"')"
 
 VERSION="$(cat main.go| grep "const AppVersion" |cut -f4 -d " " | tr -d '"')"
 
@@ -19,9 +19,9 @@ mkdir distrib
 for folder in "${target_folders[@]}"
 do
 
-  IFS=_ read -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
+  IFS=_ read -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
 
 #Fix windows binary extension
@@ -31,11 +31,11 @@ cd distrib
 
 for folder in "${target_folders[@]}"
 do
-  mv $folder arduinoOTA
+  mv "$folder" arduinoOTA
   if [[ $folder == "windows_386" ]]; then
-    zip -r arduinoOTA-$VERSION-$folder.zip arduinoOTA/
+    zip -r "arduinoOTA-${VERSION}-${folder}.zip" arduinoOTA/
   else
-    tar cjf arduinoOTA-$VERSION-$folder.tar.bz2 arduinoOTA/
+    tar cjf "arduinoOTA-${VERSION}-${folder}.tar.bz2" arduinoOTA/
   fi
   rm -rf arduinoOTA
 done