Prevent propagation of mousewheel events from list
Prevent propagation of mousewheel events from list

Without this, the autocomplete list is not scrollable using
the mouse wheel since it is consumed by the parent editor.

kevinsawicki/autocomplete-plus,atom/autocomplete,wakermahmud/autocomplete-plus,Lyleo/autocomplete-plus,brntbeer/autocomplete-plus,atom-archive/autocomplete,atom/autocomplete-plus,atom-community/autocomplete-plus,emhagman/autocomplete-jedi,emhagman/autocomplete-jedi,lestat220255/autocomplete-plus,kevinsawicki/autocomplete-plus