update main TODO

src/main.cpp

@@ -1,11 +1,11 @@
 
 /*
  * TODO:
- * - add time to apoapsis/periapsis to satellite properties
  * - use consistant name style for structs) 'UpperCase'
  * - make an 'overlay' graphic for things like apoapsis, perisapsis, f1, f2,
  *   	flight path
  * - impulsive orbital maneuvers
+ * - test multiple orbits
  * - Hohmman transfer orbits
  * - patched conic method for transferring between 2 grav bodies
  */