docs: fix typo in history

closes #15

Author: dougwilson

HISTORY.md

@@ -8,7 +8,7 @@
 ==================
 
   * deps: [email protected]
-    - Add `lastMofified` option
+    - Add `lastModified` option
     - Use `etag` to generate `ETag` header
     - deps: debug@~2.0.0