Update go-github dependency to HEAD master

Fixes google/go-github#664
id type changed from int to int64

.travis.yml

@@ -6,6 +6,6 @@ install:
   - go get -u github.com/golang/dep
   - go install github.com/golang/dep/cmd/dep
   - export PATH=$GOPATH/bin:$PATH
-  - dep ensure
+  - dep ensure -v -vendor-only
 
 script: make test

model/review.go

@@ -25,7 +25,7 @@ import (
 )
 
 type Review struct {
-	ID          int
+	ID          int64
 	Author      lowercase.String
 	Body        string
 	SubmittedAt time.Time

remote/github/github.go

@@ -279,7 +279,7 @@ func getTeamMembers(ctx context.Context, client *github.Client, org string, team
 	if err != nil {
 		return nil, err
 	}
-	var id *int
+	var id *int64
 	for _, t := range teams {
 		if strings.EqualFold(t.GetSlug(), team) {
 			id = t.ID
@@ -512,15 +512,17 @@ func createProtectionRequest(input *github.Protection) *github.ProtectionRequest
 		}
 		inDismissal := inReviews.DismissalRestrictions
 		if len(inDismissal.Users) > 0 || len(inDismissal.Teams) > 0 {
-			outDismissal := &github.DismissalRestrictionsRequest{
-				Users: []string{},
-				Teams: []string{},
-			}
+			users := []string{}
+			teams := []string{}
 			for _, user := range inDismissal.Users {
-				outDismissal.Users = append(outDismissal.Users, user.GetLogin())
+				users = append(users, user.GetLogin())
 			}
 			for _, team := range inDismissal.Teams {
-				outDismissal.Teams = append(outDismissal.Teams, team.GetSlug())
+				teams = append(teams, team.GetSlug())
+			}
+			outDismissal := &github.DismissalRestrictionsRequest{
+				Users: &users,
+				Teams: &teams,
 			}
 			outReviews.DismissalRestrictionsRequest = outDismissal
 		}