chore: revise postinstall script

Author: evenstensberg

package.json

@@ -35,7 +35,7 @@
     "format": "prettier-eslint ./bin/*.js ./test/**/*.js ./packages/**/*.js --write",
     "lint:codeOnly": "eslint \"{bin}/**/!(__testfixtures__)/*.js\" \"{bin}/**.js\"",
     "lint": "eslint \"./bin/*.js\" \"./test/**/*.js\" \"packages/**/!(node_modules)/*.test.js\"",
-    "postinstall": "npm run bootstrap",
+    "postinstall": "lerna bootstrap",
     "pretest": "npm run build && npm run lint && npm run tslint",
     "reportCoverage": "nyc report --reporter=json && codecov -f coverage/coverage-final.json --disable=gcov",
     "test": "nyc jest",