Help needed: vendor files for Prometheus support

These are the vendor files needed for Prometheus support.
I have not been able to figure out how to do this properly with gopkg.

vendor/github.com/miolini/datacounter/reader_test.go

@@ -0,0 +1,21 @@
+package datacounter
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"testing"
+)
+
+var data = []byte("Hello, World!")
+var dataLen = uint64(len(data))
+
+func TestReaderCounter(t *testing.T) {
+	buf := bytes.Buffer{}
+	buf.Write(data)
+	counter := NewReaderCounter(&buf)
+	io.Copy(ioutil.Discard, counter)
+	if counter.Count() != dataLen {
+		t.Fatalf("count mismatch len of test data: %d != %d", counter.Count(), len(data))
+	}
+}