Use vendored modules

Signed-off-by: Izuru Yakumo <yakumo.izuru@chaotic.ninja>

git-svn-id: file:///srv/svn/repo/aya/trunk@67 cec141ff-132a-4243-88a5-ce187bd62f94

vendor/github.com/alecthomas/chroma/v2/lexers/plaintext.go

@@ -0,0 +1,16 @@
+package lexers
+
+import (
+	. "github.com/alecthomas/chroma/v2" // nolint
+)
+
+var Plaintext = Register(MustNewLexer(
+	&Config{
+		Name:      "plaintext",
+		Aliases:   []string{"text", "plain", "no-highlight"},
+		Filenames: []string{"*.txt"},
+		MimeTypes: []string{"text/plain"},
+		Priority:  -1,
+	},
+	PlaintextRules,
+))