Prepare release notes for release v0.9.0#113

camille-bouvy-frequenz merged 1 commit intofrequenz-floss:v0.x.xfrequenz-floss/frequenz-client-base-python:v0.x.xfrom

camille-bouvy-frequenz:update-rncamille-bouvy-frequenz/frequenz-client-base-python:update-rnCopy head branch name to clipboard