Set CI badge to track master branch

README.md

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 ## Ethereum to Binance Chain bridge
 
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 At this version the tool for TSS is used as is. It is assumed that later part of TSS orchestration will be moved to the orchestration contract. So far, the orchestration contract is used as a database to keep data required by TSS parties during the signature generation.
 
-Read [an instruction how to run a demo](DEMO.md) for the bridge.
+Read [an instruction how to run a demo](DEMO.md) for the bridge.