[fluentd] remove Diogo Guerra [dtomasgu] as maintainer (#751)

Signed-off-by: Diogo Guerra <diogo.guerra@northerndata.de>

Author: dioguerra

charts/fluentd/Chart.yaml

@@ -12,5 +12,3 @@ sources:
 maintainers:
   - name: edsiper
     email: eduardo@treasure-data.com
-  - name: dioguerra
-    email: diogo.filipe.tomas.guerra@cern.ch

charts/fluentd/README.md

@@ -11,7 +11,6 @@ Helm chart for deploying Fluentd on Kubernetes. [Fluentd](https://www.fluentd.or
 | Name | Email | Url |
 | ---- | ------ | --- |
 | edsiper | <eduardo@treasure-data.com> |  |
-| dioguerra | <diogo.filipe.tomas.guerra@cern.ch> |  |
 
 ## Source Code