Added supported for GitHub pull request comments.

github/github.go

@@ -47,7 +47,7 @@ const (
 	MemberEvent                              Event = "member"
 	MembershipEvent                          Event = "membership"
 	MilestoneEvent                           Event = "milestone"
-  MetaEvent                                Event = "meta"
+	MetaEvent                                Event = "meta"
 	OrganizationEvent                        Event = "organization"
 	OrgBlockEvent                            Event = "org_block"
 	PageBuildEvent                           Event = "page_build"

github/github_test.go

@@ -273,6 +273,16 @@ func TestWebhooks(t *testing.T) {
 				"X-Hub-Signature": []string{"sha1=e724c9f811fcf5f511aac32e4251b08ab1a0fd87"},
 			},
 		},
+		{
+			name:     "PullRequestIssueCommentEvent",
+			event:    IssueCommentEvent,
+			typ:      IssueCommentPayload{},
+			filename: "../testdata/github/pull-request-issue-comment.json",
+			headers: http.Header{
+				"X-Github-Event":  []string{"issue_comment"},
+				"X-Hub-Signature": []string{"sha1=6c969b99ef881b5c98b2dbfc66a34465fcf0e7d4"},
+			},
+		},
 		{
 			name:     "IssuesEvent",
 			event:    IssuesEvent,

github/payload.go

@@ -1614,16 +1614,22 @@ type IssueCommentPayload struct {
 			Color       string `json:"color"`
 			Default     bool   `json:"default"`
 		} `json:"labels"`
-		State     string      `json:"state"`
-		Locked    bool        `json:"locked"`
-		Assignee  *Assignee   `json:"assignee"`
-		Assignees []*Assignee `json:"assignees"`
-		Milestone *Milestone  `json:"milestone"`
-		Comments  int64       `json:"comments"`
-		CreatedAt time.Time   `json:"created_at"`
-		UpdatedAt time.Time   `json:"updated_at"`
-		ClosedAt  *time.Time  `json:"closed_at"`
-		Body      string      `json:"body"`
+		State       string      `json:"state"`
+		Locked      bool        `json:"locked"`
+		Assignee    *Assignee   `json:"assignee"`
+		Assignees   []*Assignee `json:"assignees"`
+		Milestone   *Milestone  `json:"milestone"`
+		Comments    int64       `json:"comments"`
+		CreatedAt   time.Time   `json:"created_at"`
+		UpdatedAt   time.Time   `json:"updated_at"`
+		ClosedAt    *time.Time  `json:"closed_at"`
+		PullRequest *struct {
+			URL      string `json:"url"`
+			HTMLURL  string `json:"html_url"`
+			DiffURL  string `json:"diff_url"`
+			PatchURL string `json:"patch_url"`
+		} `json:"pull_request"`
+		Body string `json:"body"`
 	} `json:"issue"`
 	Comment struct {
 		URL      string `json:"url"`