README: drop companies from emeritus (open-telemetry#4797)

Author: xrmx

README.md

@@ -125,7 +125,7 @@ For more information about the approver role, see the [community repository](htt
 
 - [Alex Boten](https://github.com/codeboten)
 - [Chris Kleinknecht](https://github.com/c24t)
-- [Diego Hurtado](https://github.com/ocelotl), Lightstep
+- [Diego Hurtado](https://github.com/ocelotl)
 - [Owais Lone](https://github.com/owais)
 - [Reiley Yang](https://github.com/reyang)
 - [Srikanth Chekuri](https://github.com/srikanthccv)