Switch to Circle.

Author: alecthomas

Diff for: .circleci/config.yml

@@ -0,0 +1,29 @@
+version: 2
+jobs:
+  build:
+    environment:
+      GO111MODULE: "on"
+    docker:
+      - image: circleci/golang:1.14
+    working_directory: /go/src/github.com/alecthomas/chroma
+    steps:
+      - checkout
+      - run:
+          name: Prepare
+          command: |
+            curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s v1.26.0
+            mkdir ~/report
+          when: always
+      - run:
+          name: Test
+          command: |
+            go test -v ./...
+      - run:
+          name: Lint
+          command: |
+            go build ./...
+            ./bin/golangci-lint run
+      - run:
+          name: Release
+          command: |
+            curl -sL https://git.io/goreleaser | bash && goreleaser

Diff for: .travis.yml

@@ -1,4 +1,5 @@
-# Chroma — A general purpose syntax highlighter in pure Go [![Golang Documentation](https://godoc.org/github.com/alecthomas/chroma?status.svg)](https://godoc.org/github.com/alecthomas/chroma) [![Build Status](https://travis-ci.org/alecthomas/chroma.svg)](https://travis-ci.org/alecthomas/chroma) [![Gitter chat](https://badges.gitter.im/alecthomas.svg)](https://gitter.im/alecthomas/Lobby)
+# Chroma — A general purpose syntax highlighter in pure Go [![Golang Documentation](https://godoc.org/github.com/alecthomas/chroma?status.svg)](https://godoc.org/github.com/alecthomas/chroma) [![CircleCI](https://img.shields.io/circleci/project/github/alecthomas/chroma.svg)](https://circleci.com/gh/alecthomas/chroma)
+ [![Go Report Card](https://goreportcard.com/badge/github.com/alecthomas/chroma)](https://goreportcard.com/report/github.com/alecthomas/chroma) [![Slack chat](https://img.shields.io/static/v1?logo=slack&style=flat&label=slack&color=green&message=gophers)](https://gophers.slack.com/messages/CN9DS8YF3) 
 
 > **NOTE:** As Chroma has just been released, its API is still in flux. That said, the high-level interface should not change significantly.