Send interupt on Close on Linux

Updates #19

conn.go

@@ -5,8 +5,10 @@ import (
 	"bytes"
 	"errors"
 	"io"
+	"os"
 	"os/exec"
 	"regexp"
+	"runtime"
 	"time"
 )
 
@@ -57,6 +59,10 @@ func (c conn) Start() error {
 func (c conn) Close() error {
 	writeErr := c.WriteCloser.Close()
 	readErr := c.readerCloser.Close()
+	if runtime.GOOS == "linux" {
+		// See https://github.com/bep/godartsass/issues/19
+		c.cmd.Process.Signal(os.Interrupt)
+	}
 	cmdErr := c.waitWithTimeout()
 
 	if writeErr != nil {