docs: added release and build badges

Author: itzg

.goreleaser.yml

@@ -43,6 +43,7 @@ changelog:
   filters:
     exclude:
       - '^ci:'
+      - '^docs:'
 dockers:
   - image_templates:
       - "itzg/rcon-cli:{{ .Tag }}"

README.md

@@ -1,3 +1,7 @@
+[![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/itzg/rcon-cli)](https://github.com/itzg/rcon-cli/releases/latest)
+[![CircleCI](https://img.shields.io/circleci/build/github/itzg/rcon-cli)](https://app.circleci.com/pipelines/github/itzg/rcon-cli)
+
+
 A little RCON cli based on james4k's RCON library for golang.
 
 ## Installation