Fix outdated imports. Cleanup.

test/packetrate.go

@@ -1,19 +1,18 @@
 package main
 
-
 import (
 	"fmt"
 	//	"time"
-	"os"
 	"bufio"
+	"gonum.org/v1/plot"
+	"gonum.org/v1/plot/plotter"
+	"gonum.org/v1/plot/plotutil"
+	"gonum.org/v1/plot/vg"
+	"os"
+	"sort"
+	"strconv"
 	"strings"
 	"unicode"
-	"strconv"
-	"github.com/gonum/plot"
-	"github.com/gonum/plot/plotter"
-	"github.com/gonum/plot/plotutil"
-	"github.com/gonum/plot/vg"
-	"sort"
 )
 
 func main() {