update .clang-format

Added the header inclusion order to the .clang-format file generated
these changes.

Change-Id: I4f51a20f469de431ee6a5ba78e3f4da39c980fab
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/src/propertywatch.hpp b/src/propertywatch.hpp
index 2cbf6f5..a94b99e 100644
--- a/src/propertywatch.hpp
+++ b/src/propertywatch.hpp
@@ -25,7 +25,8 @@
  *  A property watch maintains the state of one or more DBus properties
  *  as specified by the supplied index.
  */
-template <typename DBusInterfaceType> class PropertyWatch : public Watch
+template <typename DBusInterfaceType>
+class PropertyWatch : public Watch
 {
   public:
     PropertyWatch() = delete;