babel-preset-es2015@6.24.1 breaks build ⚠️#64

greenkeeperio-bot wants to merge 1 commit intomastersjsyrek/lazy-linked-lists:masterfrom

greenkeeper-babel-preset-es2015-6.24.1sjsyrek/lazy-linked-lists:greenkeeper-babel-preset-es2015-6.24.1Copy head branch name to clipboard