correct a misspelling

sunxb10 · sunxb10 · commit 5be20d8a31a0 · 2014-08-10T15:06:08.000+08:00
diff --git a/free-programming-books-zh.md b/free-programming-books-zh.md
@@ -16,7 +16,7 @@
 * [Ruby](#ruby)
 * [Scala](#scala)
 * [Shell](#shell)
-* [vim](#vim)
+* [Vim](#vim)
 * [Visual Prolog](#visual-prolog)
 
 
