Update dev/README.md (#1516)

# What this PR does
Fix `cp` command usage in `dev/README.md` + add `npx playwright install`
step to integration tests instruction
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Vadim Stepanov 2023-03-09 17:09:02 +00:00 committed by GitHub
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@ -147,7 +147,8 @@ are run on pull request CI builds. New features should ideally include a new/mod
To run these tests locally simply do the following:
```bash
cp ./grafana-plugin/.env.example cp ./grafana-plugin/.env
npx playwright install # install playwright dependencies
cp ./grafana-plugin/.env.example ./grafana-plugin/.env
# you may need to tweak the values in ./grafana-plugin/.env according to your local setup
yarn test:integration
```