Update dependencies

vendor/github.com/alecthomas/chroma/lexers/p/plaintext.go

@@ -0,0 +1,16 @@
+package p
+
+import (
+	. "github.com/alecthomas/chroma" // nolint
+	"github.com/alecthomas/chroma/lexers/internal"
+)
+
+var Plaintext = internal.Register(MustNewLexer(
+	&Config{
+		Name:      "plaintext",
+		Aliases:   []string{"text", "plain", "no-highlight"},
+		Filenames: []string{"*.txt"},
+		MimeTypes: []string{"text/plain"},
+	},
+	internal.PlaintextRules,
+))