docs：更新文档

node_modules/string-hash/index.js

@@ -0,0 +1,17 @@
+"use strict";
+
+function hash(str) {
+  var hash = 5381,
+      i    = str.length;
+
+  while(i) {
+    hash = (hash * 33) ^ str.charCodeAt(--i);
+  }
+
+  /* JavaScript does bitwise operations (like XOR, above) on 32-bit signed
+   * integers. Since we want the results to be always positive, convert the
+   * signed int to an unsigned by doing an unsigned bitshift. */
+  return hash >>> 0;
+}
+
+module.exports = hash;