Bump koa from 2.10.0 to 2.16.2#15

dependabot[bot] wants to merge 1 commit intomasterplugblockchain/dev.js:masterfrom

dependabot/npm_and_yarn/koa-2.16.2plugblockchain/dev.js:dependabot/npm_and_yarn/koa-2.16.2Copy head branch name to clipboard