Fix a typo

Kuniwak · Kuniwak · commit d8ae5eb8ec15 · 2017-11-12T10:13:09.000+09:00
diff --git a/vint/ast/dictionary/autocmd_events.py b/vint/ast/dictionary/autocmd_events.py
@@ -2,7 +2,7 @@
 
 
 @unique
-class AutocmdEvents(Enum):
+class AutoCmdEvents(Enum):
     BUF_ADD = 'BufAdd'
     BUF_CREATE = 'BufCreate'
     BUF_DELETE = 'BufDelete'
