Make this more general

BenLauwens · web-flow · commit 2420811edeba · 2017-10-26T22:15:59.000+02:00
diff --git a/src/simulations.jl b/src/simulations.jl
@@ -44,7 +44,7 @@ function now(sim::Simulation)
   sim.time
 end
 
-function now(ev::Event)
+function now(ev::AbstractEvent)
   return now(environment(ev))
 end
 
