test: use nyc through tap

package.json

@@ -18,7 +18,7 @@
  "postrelease": "npm publish && git push --follow-tags",
  "pretest": "standard",
  "release": "standard-version -s",
- "test": "cross-env CACACHE_UPDATE_LOCALE_FILES=true nyc --all -- tap -J test/*.js",
+ "test": "cross-env CACACHE_UPDATE_LOCALE_FILES=true tap --coverage --nyc-arg=--all -J test/*.js",
  "test-docker": "docker run -it --rm --name pacotest -v \"$PWD\":/tmp -w /tmp node:latest npm test",
  "update-coc": "weallbehave -o . && git add CODE_OF_CONDUCT.md && git commit -m 'docs(coc): updated CODE_OF_CONDUCT.md'",
  "update-contrib": "weallcontribute -o . && git add CONTRIBUTING.md && git commit -m 'docs(contributing): updated CONTRIBUTING.md'"
@@ -76,7 +76,6 @@
  "benchmark": "^2.1.4",
  "chalk": "^2.3.2",
  "cross-env": "^5.1.4",
- "nyc": "^11.6.0",
  "require-inject": "^1.4.2",
  "safe-buffer": "^5.1.1",
  "standard": "^11.0.1",