message: updated coverage script
diff: "test": "yarn test:build && yarn test:run",
  "test:build": "tsc --build tsconfig.test.json",
  "test:run": "mocha -r tsconfig-paths/register --timeout 200000 output/tests/**/*.spec.js",
  - "cover": "yarn nyc --reporter=lcov --reporter=text yarn test",
  + "cover": "nyc --reporter=lcov --reporter=text yarn test",
  "build": "yarn clean && yarn build:es5 && yarn build:es6 && yarn build:umd && yarn run build:umd:min && yarn build:copy",
  "build:es5": "yarn tsc --build tsconfig.libes5.json",
  "build:es6": "yarn tsc --build tsconfig.libes6.json",
  "karma-typescript-preprocessor": "^0.4.0",
  "mocha": "^5.2.0",
  "mocha-lcov-reporter": "^1.3.0",
  + "nyc": "^15.1.0",
  "rollup": "^2.8.2",
  "seedrandom": "^2.4.4",
  "sharp": "^0.22.1",
  