Bump rexml from 3.2.6 to 3.3.6 in /rb#1

dependabot[bot] wants to merge 1 commit intotrunksensortower/selenium:trunkfrom

dependabot/bundler/rb/rexml-3.3.6sensortower/selenium:dependabot/bundler/rb/rexml-3.3.6Copy head branch name to clipboard