NGINX Prometheus Exporter 0.8.0

CHANGES:

• 103: Switch to gcr.io/distroless/static image. Use a non-root user to run the exporter process by default. Thanks to Alex SZAKALY.
• Update Go version to 1.14

BUGFIXES:

• 99: Fix link to metrics path. Thanks to Yoan Blanc.
• 101: docs: fix dockerfile link. Thanks to Eric Carboni.

UPGRADE:

• Use the 0.8.0 image from our DockerHub: nginx/nginx-prometheus-exporter:0.8.0
• Download the latest binaries from GitHub releases page.

COMPATIBILITY:

• NGINX 0.1.18 or newer.
• NGINX Plus R19 or newer.