add wait for empty reporting channel before closing

.idea/workspace.xml

@@ -2,7 +2,6 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="fc2840de-29dc-4fca-8e0e-a283562f60ca" name="Default Changelist" comment="">
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/reporter.go" beforeDir="false" afterPath="$PROJECT_DIR$/reporter.go" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />

reporter.go

@@ -2,6 +2,7 @@ package iperf
 
 import (
 	"github.com/BGrewell/tail"
+	"time"
 )
 
 type Reporter struct {
@@ -24,6 +25,7 @@ func (r *Reporter) Stop() {
 		if len(r.ReportingChannel) == 0 {
 			break
 		}
+		time.Sleep(1 * time.Millisecond)
 	}
 	close(r.ReportingChannel)
 }