Update docker-compose.yml

Updating to newer elasticsearch version
Changing "Version" on top to 3.5 to ensure running under Ubuntu 18
Run Grafana as root to be able to chmod provision directory for dashboard (whoami still outputs grafana instead of root so I have no Idea why this works)

docker-compose.yml

@@ -1,4 +1,4 @@
-version: '3.7'
+version: '3.5'
 services:
   parsedmarc:
     build: ./parsedmarc/
@@ -11,14 +11,15 @@ services:
     restart: on-failure
 
   elasticsearch:
-    image: docker.elastic.co/elasticsearch/elasticsearch:7.6.0
+    image: docker.elastic.co/elasticsearch/elasticsearch:7.9.1
     environment:
       - discovery.type=single-node
 
   grafana:
     build: ./grafana/
     ports:
       - 3000:3000
+    user: root
     environment:
       GF_INSTALL_PLUGINS: grafana-piechart-panel,grafana-worldmap-panel
       GF_AUTH_ANONYMOUS_ENABLED: 'true'