Bump debug, gulp-mocha and mocha#56

dependabot[bot] wants to merge 1 commit intomasterJohnPostlethwait/stringify:masterfrom

dependabot/npm_and_yarn/debug-and-gulp-mocha-and-mocha-4.3.4JohnPostlethwait/stringify:dependabot/npm_and_yarn/debug-and-gulp-mocha-and-mocha-4.3.4Copy head branch name to clipboard