use quotes for local headers

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I95f247bd17cffab8b9ef3337f48336f8d7059c2d
diff --git a/src/ADCSensor.cpp b/src/ADCSensor.cpp
index 330de52..4d3628d 100644
--- a/src/ADCSensor.cpp
+++ b/src/ADCSensor.cpp
@@ -14,9 +14,10 @@
 // limitations under the License.
 */
 
+#include "ADCSensor.hpp"
+
 #include <unistd.h>
 
-#include <ADCSensor.hpp>
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/date_time/posix_time/posix_time.hpp>