Remove duplicate JSON build steps

build/main.sh

@@ -29,18 +29,7 @@ else
 
 fi
 
-echo "checking if /json was changed..."
-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
-    exit 1
-else
-    echo "/json check passed!"
-    rm json.txt
-fi
-
-echo "running format validation on $FORMAT_FILE..."
+echo "running format validation..."
 ./validate_format.rb $FORMAT_FILE
 if [[ $? != 0 ]]; then
   echo "format validation failed!"