[update] update README.md

Author: icepy

README.md

@@ -26,7 +26,7 @@ generate([8, 12], { specials: 3, nums: 2, uppers: 3, lowers: 2 }); // Full examp
 Example:
 
 ```js
-const generate = require('./lib/index').default;
+const generate = require('../lib/index').default;
 
 const a = generate();
 
@@ -75,6 +75,14 @@ const h = generate(10, {
 });
 
 console.log('长度是10并且无大小写字母和特殊字符', h);
+
+const j = generate(10, {
+  uppers: 0,
+  lowers: 0,
+  nums: 0
+});
+
+console.log('长度是10并且无大小写字母和数字', j);
 ```
 
 ```bash