fix: start the batch submitter properly (#565)

* fix: start the batch submitter properly

fixes bug introduced in https://github.com/ethereum-optimism/optimism/pull/538/commits/933880d443538d413f8bac6488e34b3339078ad5

* chore: add changeset

.changeset/many-wombats-hear.md

+---
+"@eth-optimism/batch-submitter": patch
+---
+
+properly start the batch submitter instead of instantly exiting

packages/batch-submitter/exec/run-batch-submitter.js

 #!/usr/bin/env node
 
-console.log(process.env.npm_package_version);
-process.exit(1)
-
 const batchSubmitter = require("../dist/src/exec/run-batch-submitter")
 
 batchSubmitter.run()