move jmacd to emeritus (#4024)

* move jmacd to emeritus

* Remove @jmacd from CODEOWNERS

---------

Co-authored-by: Chester Cheung <cheung.zhy.csu@gmail.com>
Co-authored-by: Tyler Yahn <codingalias@gmail.com>

CODEOWNERS

@@ -12,6 +12,6 @@
 #  https://help.github.com/en/articles/about-code-owners
 #
 
-* @jmacd @MrAlias @Aneurysm9 @evantorrie @XSAM @dashpole @MadVikingGod @pellared @hanyuancheung @dmathieu
+* @MrAlias @Aneurysm9 @evantorrie @XSAM @dashpole @MadVikingGod @pellared @hanyuancheung @dmathieu
 
 CODEOWNERS @MrAlias @Aneurysm9 @MadVikingGod

CONTRIBUTING.md

@@ -531,7 +531,6 @@ interface that defines the specific functionality should be preferred.
 ### Approvers
 
 - [Evan Torrie](https://github.com/evantorrie), Verizon Media
-- [Josh MacDonald](https://github.com/jmacd), LightStep
 - [Sam Xie](https://github.com/XSAM), Cisco/AppDynamics
 - [David Ashpole](https://github.com/dashpole), Google
 - [Robert Pająk](https://github.com/pellared), Splunk
@@ -547,6 +546,7 @@ interface that defines the specific functionality should be preferred.
 ### Emeritus
 
 - [Gustavo Silva Paiva](https://github.com/paivagustavo), LightStep
+- [Josh MacDonald](https://github.com/jmacd), LightStep
 
 ### Become an Approver or a Maintainer