Update README.md

typo

Author: YaoHuiJi

README.md

@@ -70,7 +70,7 @@ zip(sourcePath, targetPath)
 
 **`zipWithPassword(source: string | string[], target: string, password: string, encryptionType: string): Promise<string>`**
 
-> zip source to target`
+> zip source to target
 
 ***NOTE: the string version of source is for folder, the string[] version is for file, so if you want to zip a single file, use zip([file]) instead of zip(file)***