Update README.md (#3982)

Forgot a word in README

README.md

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 ## Why Bacalhau?
 - :zap: **Fast job processing**: Jobs in Bacalhau are processed where the data was created and all jobs are parallel by default.
 - :moneybag: **Low cost**: Reduce (or eliminate) ingress/egress costs since jobs are processed closer to the source. Take advantage of as well idle computation capabilities at the edge.
-- :lock: **Secure**: Data scrubbing and security can before migration to reduce the chance of leaking private information, and with a far more granular, code-based permission model.
+- :lock: **Secure**: Data scrubbing and security can happen before migration to reduce the chance of leaking private information, and with a far more granular, code-based permission model.
 - 🚛 **Large-scale data**: Bacalhau operates on a network of open compute resources made available to serve any data processing workload. With Bacalhau, you can batch process petabytes (quadrillion bytes) of data.
 
 ## Getting started - Bacalhau in 1 minute