build(deps): bump acorn from 6.3.0 to 6.4.1 in /frontend#1

dependabot[bot] wants to merge 1 commit intomasterthmlab/hrflex:masterfrom

dependabot/npm_and_yarn/frontend/acorn-6.4.1thmlab/hrflex:dependabot/npm_and_yarn/frontend/acorn-6.4.1Copy head branch name to clipboard