Update README.md

Author: dgzlopes

README.md

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-This extension adds distributed tracing support to [k6](https://github.com/k6io/k6)! That means, that if you're testing a system that has distributed tracing instrumentation, you can use this extension to start the traces on [k6](https://github.com/k6io/k6). 
+This extension adds distributed tracing support to [k6](https://github.com/k6io/k6)! That means, that if you're testing a system is instrumented, you can use this extension to start the traces on k6. 
 
 It is implemented using the [xk6](https://github.com/k6io/xk6) extension system.