Document reasoning on error silencing

scripts/postinstall.js

@@ -27,5 +27,8 @@ try {
     .then(() => serverless.utils.logStat(serverless, 'install'))
     .catch(() => {});
 } catch (error) {
-  // fail silently
+  // Ignore any eventual errors.
+  // Package when installed globally may be installed in uncommon user contexts,
+  // that may lead to fs access related crashes
+  // when e.g. trying to access user's .serverlessrc config
 }