Specify npm tag to check when waiting for npm release to complete

The npm tag we wait on needs to match the one which was used when the
release was published.

Jenkinsfile

@@ -151,7 +151,7 @@ node {
                 // See https://github.com/yarnpkg/yarn/pull/3391.
                 sh "echo '//registry.npmjs.org/:_authToken=${env.NPM_TOKEN}' >> \$HOME/.npmrc"
                 sh "npm publish --tag ${npmTag}"
-                sh "scripts/wait-for-npm-release.sh"
+                sh "scripts/wait-for-npm-release.sh ${npmTag}"
 
                 // Deploy the client to cdn.hypothes.is, where the embedded
                 // client is served from by https://hypothes.is/embed.js.