update main TODO

src/main.cpp

@@ -1,7 +1,6 @@
 
 /*
  * TODO:
- * - add coordinate directions overlay
  * - impulsive orbital maneuvers
  * - replace instances of glm:: with using directives
  * - compile with '-pedantic' and fix macro warnings
@@ -11,6 +10,7 @@
  * - Hohmman transfer orbits
  * - make an 'overlay' graphic for things like apoapsis, perisapsis, f1, f2,
  *   	flight path
+ *		- fix coordinate directions overlay 
  * - patched conic method for transferring between 2 grav bodies
  * - test parabolic/hyperbolic trajectories
  * - organize orbit functions into interface/internal functions