Updated auth config example

Author: codebien

README.md

@@ -25,7 +25,11 @@ K6_PROMETHEUS_REMOTE_URL=http://localhost:9090/api/v1/write ./k6 run script.js -
 
 Add TLS and HTTP basic authentication:
 ```
-K6_PROMETHEUS_REMOTE_URL=https://localhost:9090/api/v1/write K6_PROMETHEUS_INSECURE_SKIP_TLS_VERIFY=false K6_CA_CERT_FILE=example/tls.crt K6_PROMETHEUS_USER=foo K6_PROMETHEUS_PASSWORD=bar ./k6 run script.js -o output-prometheus-remote
+K6_PROMETHEUS_REMOTE_URL=https://localhost:9090/api/v1/write \
+K6_PROMETHEUS_INSECURE_SKIP_TLS_VERIFY=false \
+K6_PROMETHEUS_USERNAME=foo \
+K6_PROMETHEUS_PASSWORD=bar \
+./k6 run script.js -o output-prometheus-remote
 ```
 
 Note: Prometheus remote client relies on a snappy library for serialization which could panic on [encode operations](https://github.com/golang/snappy/blob/544b4180ac705b7605231d4a4550a1acb22a19fe/encode.go#L22).