Merge pull request KumarRobotics#72 from msamogh/master

Fix compilation error on ROS Melodic on Ubuntu 18.04

Author: ke-sun

src/image_processor_nodelet.cpp

@@ -17,8 +17,8 @@ void ImageProcessorNodelet::onInit() {
   return;
 }
 
-PLUGINLIB_DECLARE_CLASS(msckf_vio, ImageProcessorNodelet,
-    msckf_vio::ImageProcessorNodelet, nodelet::Nodelet);
+PLUGINLIB_EXPORT_CLASS(msckf_vio::ImageProcessorNodelet,
+    nodelet::Nodelet);
 
 } // end namespace msckf_vio
 

src/msckf_vio_nodelet.cpp

@@ -17,8 +17,8 @@ void MsckfVioNodelet::onInit() {
   return;
 }
 
-PLUGINLIB_DECLARE_CLASS(msckf_vio, MsckfVioNodelet,
-    msckf_vio::MsckfVioNodelet, nodelet::Nodelet);
+PLUGINLIB_EXPORT_CLASS(msckf_vio::MsckfVioNodelet,
+    nodelet::Nodelet);
 
 } // end namespace msckf_vio