feat: update to go modules

vendor/github.com/alecthomas/chroma/lexers/d/diff.go

@@ -1,29 +0,0 @@
-package d
-
-import (
-	. "github.com/alecthomas/chroma" // nolint
-	"github.com/alecthomas/chroma/lexers/internal"
-)
-
-// Diff lexer.
-var Diff = internal.Register(MustNewLexer(
-	&Config{
-		Name:      "Diff",
-		Aliases:   []string{"diff", "udiff"},
-		EnsureNL:  true,
-		Filenames: []string{"*.diff", "*.patch"},
-		MimeTypes: []string{"text/x-diff", "text/x-patch"},
-	},
-	Rules{
-		"root": {
-			{` .*\n`, Text, nil},
-			{`\+.*\n`, GenericInserted, nil},
-			{`-.*\n`, GenericDeleted, nil},
-			{`!.*\n`, GenericStrong, nil},
-			{`@.*\n`, GenericSubheading, nil},
-			{`([Ii]ndex|diff).*\n`, GenericHeading, nil},
-			{`=.*\n`, GenericHeading, nil},
-			{`.*\n`, Text, nil},
-		},
-	},
-))