Update MAINTAINERS.md (#647)

Stepping down to make way for others because unfortunately I have not been as active as I would like. It has been a great honour working with you all, and I hope to continue contributing as much as I can.

Signed-off-by: Trishank Karthik Kuppusamy <trishank.kuppusamy@datadoghq.com>

MAINTAINERS.md

@@ -12,12 +12,13 @@ The [@theupdateframework/go-tuf-maintainers](https://github.com/orgs/theupdatefr
 | Marina Moore               | [@mnm678](https://github.com/mnm678)                       | NYU                                        |
 | Marvin Drees               | [@MDr164](https://github.com/MDr164)                       | [@9elements](https://github.com/9elements) |
 | Radoslav Dimitrov          | [@rdimitrov](https://github.com/rdimitrov)                 | [@Stacklok](https://github.com/stacklok)   |
-| Trishank Karthik Kuppusamy | [@trishankatdatadog](https://github.com/trishankatdatadog) | [@DataDog](https://github.com/DataDog)     |
+
 
 ## Emeritus
 
 We are deeply indebted to our emeritus maintainers below:
 
-| Maintainer         | GitHub ID                                                 | Affiliation |
-| ------------------ | --------------------------------------------------------- | ----------- |
-| Zack Newman        | [@znewman01](https://github.com/znewman01)                | N/A         |
+| Maintainer                 | GitHub ID                                                  |
+| -------------------------- | ---------------------------------------------------------- |
+| Trishank Karthik Kuppusamy | [@trishankatdatadog](https://github.com/trishankatdatadog) |
+| Zack Newman                | [@znewman01](https://github.com/znewman01)                 |