docs(CHANGELOG): update for v0.5.2

also cleanup imports

CHANGELOG.md

 # go-graphsync changelog
 
+# go-graphsync 0.5.2
+
+Minor release resolves bugs in notification system
+
+### Changelog
+
+- github.com/ipfs/go-graphsync:
+  - RegisterNetworkErrorListener should fire when there's an error connecting to the peer (#127) ([ipfs/go-graphsync#127](https://github.com/ipfs/go-graphsync/pull/127))
+  - Permit multiple data subscriptions per original topic (#128) ([ipfs/go-graphsync#128](https://github.com/ipfs/go-graphsync/pull/128))
+  - release: v0.5.1 (#123) ([ipfs/go-graphsync#123](https://github.com/ipfs/go-graphsync/pull/123))
+
+### Contributors
+
+| Contributor | Commits | Lines ± | Files Changed |
+|-------------|---------|---------|---------------|
+| dirkmc | 2 | +272/-185 | 10 |
+| Alex Cruikshank | 1 | +188/-110 | 12 |
+| Hannah Howard | 1 | +23/-6 | 3 |
+
 # go-graphsync 0.5.1
 
 ### Changelog

impl/graphsync_test.go

@@ -1043,7 +1043,6 @@ func TestGraphsyncBlockListeners(t *testing.T) {
 	require.Equal(t, blockChainLength, blocksSent)
 }
 
-
 type gsTestData struct {
 	mn                       mocknet.Mocknet
 	ctx                      context.Context

notifications/data_subscriber.go

@@ -3,8 +3,8 @@ package notifications
 import "sync"
 
 type TopicDataSubscriber struct {
-	idMapLk        sync.RWMutex
-	data           map[Topic][]TopicData
+	idMapLk sync.RWMutex
+	data    map[Topic][]TopicData
 	Subscriber
 }
 
@@ -12,8 +12,8 @@ type TopicDataSubscriber struct {
 // events and topics before passing them on to the given subscriber
 func NewTopicDataSubscriber(sub Subscriber) *TopicDataSubscriber {
 	return &TopicDataSubscriber{
-		Subscriber:     sub,
-		data:           make(map[Topic][]TopicData),
+		Subscriber: sub,
+		data:       make(map[Topic][]TopicData),
 	}
 }
 

notifications/types.go

@@ -36,7 +36,7 @@ type EventTransform func(Event) Event
 // Notifee is a topic data subscriber plus a set of data you want to add to any topics subscribed to
 // (used to call SubscribeWithData to inject data when events for a given topic emit)
 type Notifee struct {
-	Data      TopicData
+	Data       TopicData
 	Subscriber *TopicDataSubscriber
 }
 

requestmanager/requestmanager.go

@@ -6,9 +6,6 @@ import (
 	"fmt"
 	"sync/atomic"
 
-	"github.com/ipfs/go-graphsync/listeners"
-	"github.com/ipfs/go-graphsync/messagequeue"
-
 	blocks "github.com/ipfs/go-block-format"
 	"github.com/ipfs/go-cid"
 	logging "github.com/ipfs/go-log"
@@ -20,7 +17,9 @@ import (
 	"github.com/ipfs/go-graphsync/cidset"
 	"github.com/ipfs/go-graphsync/dedupkey"
 	ipldutil "github.com/ipfs/go-graphsync/ipldutil"
+	"github.com/ipfs/go-graphsync/listeners"
 	gsmsg "github.com/ipfs/go-graphsync/message"
+	"github.com/ipfs/go-graphsync/messagequeue"
 	"github.com/ipfs/go-graphsync/metadata"
 	"github.com/ipfs/go-graphsync/notifications"
 	"github.com/ipfs/go-graphsync/requestmanager/executor"

requestmanager/requestmanager_test.go

@@ -7,8 +7,6 @@ import (
 	"testing"
 	"time"
 
-	"github.com/ipfs/go-graphsync/listeners"
-
 	blocks "github.com/ipfs/go-block-format"
 	"github.com/ipld/go-ipld-prime"
 	cidlink "github.com/ipld/go-ipld-prime/linking/cid"
@@ -18,6 +16,7 @@ import (
 	"github.com/ipfs/go-graphsync"
 	"github.com/ipfs/go-graphsync/cidset"
 	"github.com/ipfs/go-graphsync/dedupkey"
+	"github.com/ipfs/go-graphsync/listeners"
 	gsmsg "github.com/ipfs/go-graphsync/message"
 	"github.com/ipfs/go-graphsync/metadata"
 	"github.com/ipfs/go-graphsync/notifications"

responsemanager/peerresponsemanager/peerresponsesender.go

@@ -467,7 +467,7 @@ func (prs *peerResponseSender) sendResponseMessages() {
 			continue
 		}
 		notifications.SubscribeWithData(prs.publisher, builder.Topic(), notifications.Notifee{
-			Data:      builder.BlockSize(),
+			Data:       builder.BlockSize(),
 			Subscriber: prs.allocatorSubscriber,
 		})
 		responses, blks, err := builder.Build()
@@ -476,7 +476,7 @@ func (prs *peerResponseSender) sendResponseMessages() {
 		}
 
 		prs.peerHandler.SendResponse(prs.p, responses, blks, notifications.Notifee{
-			Data:      builder.Topic(),
+			Data:       builder.Topic(),
 			Subscriber: prs.subscriber,
 		})
 

testutil/testnotifications.go

@@ -88,7 +88,7 @@ func (nv *NotifeeVerifier) ExpectClose(ctx context.Context, t *testing.T) {
 func NewTestNotifee(data notifications.TopicData, bufferSize int) (notifications.Notifee, *NotifeeVerifier) {
 	subscriber := NewTestSubscriber(bufferSize)
 	return notifications.Notifee{
-			Data:      data,
+			Data:       data,
 			Subscriber: notifications.NewTopicDataSubscriber(subscriber),
 		}, &NotifeeVerifier{
 			expectedTopic: data,