chore: check result before uploading (close #24)

guard.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+[[ $(wc -l result/china.txt) < 3000 ]] && exit 1
+
+[[ $(wc -l result/china6.txt) < 1000 ]] && exit 2
+
+exit 0