Recently, this petition has been gaining an enormous amount of traction, so I figured it would be simple enough to add to the game. So, here it is, for you to enjoy in all it's glory.
I head a proper description of the datapack must be included, so here it is: this datapack adds a new advancement for when you kill a creeper. It is titled "Creeper, aw man." This idea is based off a viral petition for Mojang to add this advancement to the official game. Clearly, people are wanting this, so here I am to deliver. Other than that, the datapack does nothing else.