use quotes for local headers

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I95f247bd17cffab8b9ef3337f48336f8d7059c2d
diff --git a/src/CPUSensor.cpp b/src/CPUSensor.cpp
index 0ec4bf5..5aedf4b 100644
--- a/src/CPUSensor.cpp
+++ b/src/CPUSensor.cpp
@@ -14,10 +14,12 @@
 // limitations under the License.
 */
 
+#include "CPUSensor.hpp"
+
+#include "Utils.hpp"
+
 #include <unistd.h>
 
-#include <CPUSensor.hpp>
-#include <Utils.hpp>
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/date_time/posix_time/posix_time.hpp>