Faster acceleration for rockets and explosive rockets.

[linktothepast83]

Currently when i use my spidertrons filled with explosive rockets, the rockets they shoot tend to follow them from behind until they play catch up. I use 3 exoskeletons with them so while such usage might not be that common it is perfectly within the limits of what is allowed in vanilla factorio. Plz make the rockets accelerate faster or even take into account the initial speed of the player during launch. Being faster than your own shooting rockets seems wrong and reduces the fun of a fast moving spidertron.