Merge pull request #5 from Luzilla/ci

CI stuff

.circleci/config.yml

@@ -0,0 +1,20 @@
+version: 2.1
+workflows:
+  main:
+    jobs:
+      - release:
+          # Only run this job on git tag pushes
+          filters:
+            branches:
+              ignore: /.*/
+            tags:
+              only: /v[0-9]+(\.[0-9]+)*(-.*)*/
+jobs:
+  release:
+    docker:
+      - image: circleci/golang:1.12
+    steps:
+      - checkout
+      - run: curl -sL https://git.io/goreleaser | bash
+      - run: goreleaser check
+      - run: goreleaser --snapshot --rm-dist

README.md

@@ -1,5 +1,7 @@
 # dnsbl-exporter
 
+[![CircleCI](https://circleci.com/gh/Luzilla/dnsbl_exporter.svg?style=svg)](https://circleci.com/gh/Luzilla/dnsbl_exporter) [![Maintainability](https://api.codeclimate.com/v1/badges/31b95e6c679f60e30bea/maintainability)](https://codeclimate.com/github/Luzilla/dnsbl_exporter/maintainability)
+
 This is a server which checks the configured hosts against various DNSBL (sometimes refered to as RBLs).
 
 The idea is to scrape `/metrics` using Prometheus to create graphs, alerts, and so on.