Bump acorn from 6.2.1 to 6.4.1#49

thomashoneyman merged 1 commit intomasterpurescript-contrib/purescript-string-parsers:masterfrom

dependabot/npm_and_yarn/acorn-6.4.1purescript-contrib/purescript-string-parsers:dependabot/npm_and_yarn/acorn-6.4.1Copy head branch name to clipboard