Update contacts for Fastly (#276)

* Update contacts for Fastly

Guy is no longer with us

* drop "at edge"

not part of our branding anymore

Author: zkat

ADOPTERS.md

@@ -5,7 +5,7 @@ this list. The list is in alphabetical order._
 
 | Organization                            | Contact                                            | Status                                                                  | Description of Use                                                                                                                                              |
 | --------------------------------------- | -------------------------------------------------- | ----------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| [Fastly](https://www.fastly.com)        | [@guybedford](https://github.com/guybedford)       | ![production](https://img.shields.io/badge/-production-blue?style=flat) | Fastly's [JS SDK](https://github.com/fastly/js-compute-runtime) for Compute at edge is powered by StarlingMonkey.                                               |
+| [Fastly](https://www.fastly.com)        | [@zkat](https://github.com/zkat) and [@TartanLlama](https://github.com/TartanLlama)      | ![production](https://img.shields.io/badge/-production-blue?style=flat) | Fastly's [JS SDK](https://github.com/fastly/js-compute-runtime) for Compute is powered by StarlingMonkey.                                               |
 | [Fermyon](https://www.fermyon.com/)     | [@tschneidereit](https://github.com/tschneidereit) | ![production](https://img.shields.io/badge/-production-blue?style=flat) | [Fermyon Spin](https://www.fermyon.com/spin) supports serverless Wasm apps, using StarlingMonkey for its [Spin JS SDK](https://github.com/fermyon/spin-js-sdk). |
 | [Gcore](https://www.gcore.com/fastedge) | [@godronus](https://github.com/godronus)           | ![production](https://img.shields.io/badge/-production-blue?style=flat) | [FastEdge-sdk-js](https://github.com/G-Core/FastEdge-sdk-js) powered by StarlingMonkey for JavaScript execution.                                                |
 | [Riza](https://riza.io/)                | [@kyleconroy](https://github.com/kyleconroy)       | ![production](https://img.shields.io/badge/-production-blue?style=flat) | The [Riza Code Interpreter API](https://docs.riza.io) relies on StarlingMonkey for isolated JavaScript execution.                                               |