Fix 'async function' snippet alias so it doesn't colide with 'function' snippet alias.
Fix 'async function' snippet alias so it doesn't colide with 'function' snippet alias.

adam-e-trepanier/vim-snippets,needle-wang/vim-snippets,LogicalBricks/vim-snippets,phatograph/vim-snippets,kevinkirkup/vim-snippets,craigp/vim-snippets,honza/vim-snippets,phatograph/vim-snippets,adam-e-trepanier/vim-snippets,LogicalBricks/vim-snippets,sjewo/vim-snippets,honza/vim-snippets,kevinkirkup/vim-snippets,vito-c/vim-snippets,needle-wang/vim-snippets,sjewo/vim-snippets,craigp/vim-snippets,vito-c/vim-snippets