add script pretest

Author: taoqf

package.json

@@ -10,7 +10,8 @@
 		"ts:cjs": "tsc -m commonjs",
 		"ts:umd": "tsc -t es5 -m umd --outDir ./dist/umd/",
 		"build": "npm run clean && npm run ts:cjs && npm run ts:umd",
-		"dev": "tsc -w"
+		"dev": "tsc -w",
+		"pretest": "tsc -m commonjs"
 	},
 	"keywords": [
 		"fast html parser nodejs typescript"
@@ -57,4 +58,4 @@
 		"url": "https://github.com/taoqf/node-fast-html-parser/issues"
 	},
 	"homepage": "https://github.com/taoqf/node-fast-html-parser"
-}
+}