Force postinstall to run with concurrency 1

Author: CompuIves

package.json

@@ -37,7 +37,7 @@
     "build:embed": "lerna run build:embed --scope app --stream && gulp",
     "build:prod": "cross-env NODE_OPTIONS=\"--max-old-space-size=4096\" lerna run build  --scope homepage --stream && lerna run build --scope app --stream && lerna run copy-assets --scope app --stream",
     "commit": "concurrently \"yarn typecheck\" \"yarn lint\" && git commit -m",
-    "postinstall": "yarn lerna run install-dependencies --stream && opencollective postinstall",
+    "postinstall": "yarn lerna run install-dependencies --stream --concurrency 1 && opencollective postinstall",
     "contributors:add": "all-contributors add",
     "contributors:generate": "all-contributors generate",
     "lint": "lerna run lint --stream",