feat: update to go modules

vendor/github.com/alecthomas/chroma/.goreleaser.yml

@@ -1,31 +0,0 @@
-project_name: chroma
-release:
-  github:
-    owner: alecthomas
-    name: chroma
-brew:
-  install: bin.install "chroma"
-builds:
-- goos:
-  - linux
-  - darwin
-  - windows
-  goarch:
-  - amd64
-  - "386"
-  goarm:
-  - "6"
-  main: ./cmd/chroma/main.go
-  ldflags: -s -w -X main.version={{.Version}} -X main.commit={{.Commit}} -X main.date={{.Date}}
-  binary: chroma
-archive:
-  format: tar.gz
-  name_template: '{{ .Binary }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{
-    .Arm }}{{ end }}'
-  files:
-  - COPYING
-  - README*
-snapshot:
-  name_template: SNAPSHOT-{{ .Commit }}
-checksum:
-  name_template: '{{ .ProjectName }}-{{ .Version }}-checksums.txt'