message: package.json: fix preversion tests
diff: "_dr.js": "dr.js _dr.json && cp img/ijs-anim-short.svg img/ijs-32.png dist/docs/img",
  "precommit": "npm run lint -- --fail-on-error",
  "prepush": "npm run preversion",
  - "preversion": "echo $npm_package_version",
  + "preversion": "npm test && istanbul check-coverage",
  "version": "git clean -fx dist && git add -- package.json && npm run build -- --no-metadata && git add -A -- dist",
  "postversion": "",
  "release": "npm version --no-git-tag-version -m 'v%s'",
  