Bump prismjs from 1.17.1 to 1.21.0 in /vue-router-dev#12

dependabot[bot] wants to merge 1 commit intomastergitbu/learn-vue:masterfrom

dependabot/npm_and_yarn/vue-router-dev/prismjs-1.21.0gitbu/learn-vue:dependabot/npm_and_yarn/vue-router-dev/prismjs-1.21.0Copy head branch name to clipboard