Fix ProGuard file path

ProGuard couldn't recognize the file path when the path contains ' - '. The fix here is trying to use single and double quotes to quote the file path and ProGuard options. 
e.g. java -jar proguard.jar proguard.cfg -injars '"[path]/android - app/lib1.jar"' -injars '"[path]/android - app/lib2.jar"(!META-INF/maven/**!META-INF/MANIFEST.MF)' -outjars '"[path]/android - app/out.jar"' -dump '"[path]/android - app/dump.txt"' -printseeds '"[path]/android - app/seeds.txt"' -printusage '"[path]/android - app/usage.txt"' -printmapping '"[path]/android - app/mapping.txt"'