Update receiver README.md (#563)
Update receiver README.md (#563)

* Update README.md

* Update README.md

* Update README.md

* Update receiver/README.md

Co-Authored-By: Paulo Janotti <fd077434a7c3095bfe440741787d02f6a7bab07e@omnition.io>

* Update receiver/README.md

Co-Authored-By: Paulo Janotti <fd077434a7c3095bfe440741787d02f6a7bab07e@omnition.io>

* Update receiver/README.md

Co-Authored-By: Paulo Janotti <fd077434a7c3095bfe440741787d02f6a7bab07e@omnition.io>

* Update receiver/README.md

Co-Authored-By: Paulo Janotti <fd077434a7c3095bfe440741787d02f6a7bab07e@omnition.io>

Co-authored-by: Paulo Janotti <fb3c50f0909c68d530a508e5461af2d6764bf479@splunk.com>

open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector