doc: add cjihrig GPG ID

PR-URL: libuv#877
Reviewed-By: Saúl Ibarra Corretgé <[email protected]>

MAINTAINERS.md

@@ -7,6 +7,7 @@ libuv is currently managed by the following individuals:
   - GPG key: D77B 1E34 243F BAF0 5F8E  9CC3 4F55 C8C8 46AB 89B9 (pubkey-bnoordhuis)
 * **Bert Belder** ([@piscisaureus](https://github.com/piscisaureus))
 * **Colin Ihrig** ([@cjihrig](https://github.com/cjihrig))
+  - GPG key: 94AE 3667 5C46 4D64 BAFA  68DD 7434 390B DBE9 B9C5 (pubkey-cjihrig)
 * **Fedor Indutny** ([@indutny](https://github.com/indutny))
   - GPG key: AF2E EA41 EC34 47BF DD86  FED9 D706 3CCE 19B7 E890 (pubkey-indutny)
 * **Saúl Ibarra Corretgé** ([@saghul](https://github.com/saghul))
@@ -34,4 +35,3 @@ be garbage collected since nothing references it, so we'll create a tag for it:
 Commit the changes and push:
 
     $ git push origin pubkey-saghul
-