clang-tidy: fix typo

The Checks string isn't terminated with a single quote, so clang doesn't
work.  Add the missing quote.

Tested: nope
Change-Id: Ic45fa8f2ccd1399cb9748196d16e211282cea2b0
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/.clang-tidy b/.clang-tidy
index 989dd74..1dc6a0c 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -239,7 +239,7 @@
 readability-delete-null-pointer,
 readability-deleted-default,
 readability-else-after-return,
-readability-identifier-naming,
+readability-identifier-naming'
 
 WarningsAsErrors: '*'
 HeaderFilterRegex: '.*'