Update plugin list
Update plugin list

This removes the obsolete acorn-es7-plugin, replaces UXtemple/acorn-object-spread with adrianheine/acorn5-object-spread and adds acorn-dynamic-import.
mathiasbynens/acorn,ternjs/acorn,TimothyGu/acorn,mysticatea/acorn,mysticatea/acorn,ajaxorg/acorn,ternjs/acorn,marijnh/acorn,marijnh/acorn,marijnh/acorn,TimothyGu/acorn,ternjs/acorn,mathiasbynens/acorn,ajaxorg/acorn,TimothyGu/acorn,mathiasbynens/acorn,mysticatea/acorn,ajaxorg/acorn