Add #include <boost/format.hpp>

[lalten]

When building jsk_topic_tools on Ubuntu 18.04 with Ros Melodic and Boost 1.65.1.0ubuntu1 I get this error:

Starting  >>> jsk_topic_tools                                                                            
________________________________________________________________________________________________________ 
Errors     << jsk_topic_tools:make /home/laurenz/catkin_ws/logs/jsk_topic_tools/build.make.001.log       
/home/laurenz/catkin_ws/src/jsk/jsk_common/jsk_topic_tools/src/standalone_complexed_nodelet.cpp: In funct
ion ‘int main(int, char**)’:                                                                             
/home/laurenz/catkin_ws/src/jsk/jsk_common/jsk_topic_tools/src/standalone_complexed_nodelet.cpp:75:38: er
ror: ‘format’ is not a member of ‘boost’                                                                 
     candidate_root.push_back((boost::format("nodelets_%lu") % i).str());                                
                                      ^~~~~~                                                             
/home/laurenz/catkin_ws/src/jsk/jsk_common/jsk_topic_tools/src/standalone_complexed_nodelet.cpp:75:38: no
te: suggested alternative: ‘forward’                                                                     
     candidate_root.push_back((boost::format("nodelets_%lu") % i).str());                                
                                      ^~~~~~                                                             
                                      forward                                                            
make[2]: *** [CMakeFiles/standalone_complexed_nodelet.dir/src/standalone_complexed_nodelet.cpp.o] Error 1
make[1]: *** [CMakeFiles/standalone_complexed_nodelet.dir/all] Error 2                                   
make[1]: *** Waiting for unfinished jobs....                                                             
make: *** [all] Error 2                                                                                  

which is easily fixed by including the appropriate include.
Apparently it wasn't needed with boost 1.62: wisk/medusa#65

[k-okada]

thanks!