Update README.md

Author: asiripanich

README.md

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 # bangkok-gtfs
 
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+[![snap-gtfs](https://github.com/asiripanich/bangkok-gtfs/actions/workflows/snap-gtfs.yaml/badge.svg)](https://github.com/asiripanich/bangkok-gtfs/actions/workflows/snap-gtfs.yaml)
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 The goal of bangkok-gtfs is to make daily snapshots of Bangkok GTFS