Added missing include guards (#98)

Author: b-adkins

behaviortree_ros2/include/behaviortree_ros2/bt_utils.hpp

@@ -11,6 +11,8 @@
 // COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+#pragma once
+
 #include <functional>
 #include <memory>
 #include <thread>

behaviortree_ros2/include/behaviortree_ros2/tree_execution_server.hpp

@@ -11,6 +11,8 @@
 // COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+#pragma once
+
 #include <memory>
 #include <optional>