docs: Remove authors from releases (#531)

A git shortlog provides the same functionality.

Signed-off-by: Daniel González Lopes <[email protected]>

Author: dgzlopes

README.md

@@ -136,21 +136,6 @@ release](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v0.
 - Prometheus Metrics Exporter
 - New Examples and Improvements to Existing Examples
 
-Thank you to the following individuals for contributing to this release:
-
-* Alex Boten
-* Chris Kleinknecht
-* Christian Neumüller
-* Daniel González
-* Diego Hurtado
-* Golovin Pavel
-* Hector Hernandez
-* Jake Malachowski
-* Joshua H Lang
-* Leighton Chen
-* Mauricio Vásquez
-* Yusuke Tsutsumi
-
 The [v0.5 beta
 release](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v0.5.0) release includes:
 
@@ -160,18 +145,6 @@ release](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v0.
 - Global configuration module
 - Documentation improvements
 
-Thank you to the following individuals for contributing to this release:
-
-* Alex Boten
-* Chris Kleinknecht
-* Dave Grochowski
-* Diego Hurtado
-* Hector Hernandez
-* Leighton Chen
-* Liz Fong-Jones
-* Mauricio Vásquez
-* Yusuke Tsutsumi
-
 See the [project
 milestones](https://github.com/open-telemetry/opentelemetry-python/milestones)
 for details on upcoming releases. The dates and features described here are