Fix a stupid raw string

build/main.sh

@@ -19,7 +19,7 @@ else
 fi
 
 echo "checking if /json was changed..."
-egrep "\+{3}\s.\/json\/" 527.diff > json.txt
+egrep "\+{3}\s.\/json\/" diff.txt > json.txt
 if [[$? == 0]]; then
     echo "JSON files are auto-generated! Please do not update these files:"
     cat json.txt