fix: use the correct opn-cli command (danielfsousa#331)

package.json

@@ -23,12 +23,12 @@
     "test:integration": "cross-env NODE_ENV=test mocha --timeout 20000 --exit src/api/tests/integration",
     "test:watch": "cross-env NODE_ENV=test mocha --watch src/api/tests/unit",
     "coverage": "nyc report --reporter=text-lcov | coveralls",
-    "postcoverage": "opn coverage/lcov-report/index.html",
+    "postcoverage": "open-cli coverage/lcov-report/index.html",
     "validate": "yarn lint && yarn test",
     "postpublish": "git push --tags",
     "deploy": "sh ./deploy.sh",
     "docs": "apidoc -i src -o docs",
-    "postdocs": "opn docs/index.html",
+    "postdocs": "open-cli docs/index.html",
     "docker:start": "cross-env NODE_ENV=production pm2-docker start ./src/index.js",
     "docker:prod": "docker-compose -f docker-compose.yml -f docker-compose.prod.yml up",
     "docker:dev": "docker-compose -f docker-compose.yml -f docker-compose.dev.yml up",