[Vendor] upgrade google/go-github to v32.1.0 (#12361)

* upgrate go-github client to v32.1.0

* migrate

vendor/github.com/google/go-github/v32/github/users_followers.go

@@ -0,0 +1,122 @@
+// Copyright 2013 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import (
+	"context"
+	"fmt"
+)
+
+// ListFollowers lists the followers for a user. Passing the empty string will
+// fetch followers for the authenticated user.
+//
+// GitHub API docs: https://developer.github.com/v3/users/followers/#list-followers-of-a-user
+// GitHub API docs: https://developer.github.com/v3/users/followers/#list-followers-of-the-authenticated-user
+func (s *UsersService) ListFollowers(ctx context.Context, user string, opts *ListOptions) ([]*User, *Response, error) {
+	var u string
+	if user != "" {
+		u = fmt.Sprintf("users/%v/followers", user)
+	} else {
+		u = "user/followers"
+	}
+	u, err := addOptions(u, opts)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var users []*User
+	resp, err := s.client.Do(ctx, req, &users)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return users, resp, nil
+}
+
+// ListFollowing lists the people that a user is following. Passing the empty
+// string will list people the authenticated user is following.
+//
+// GitHub API docs: https://developer.github.com/v3/users/followers/#list-the-people-the-authenticated-user-follows
+// GitHub API docs: https://developer.github.com/v3/users/followers/#list-the-people-a-user-follows
+func (s *UsersService) ListFollowing(ctx context.Context, user string, opts *ListOptions) ([]*User, *Response, error) {
+	var u string
+	if user != "" {
+		u = fmt.Sprintf("users/%v/following", user)
+	} else {
+		u = "user/following"
+	}
+	u, err := addOptions(u, opts)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var users []*User
+	resp, err := s.client.Do(ctx, req, &users)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return users, resp, nil
+}
+
+// IsFollowing checks if "user" is following "target". Passing the empty
+// string for "user" will check if the authenticated user is following "target".
+//
+// GitHub API docs: https://developer.github.com/v3/users/followers/#check-if-a-person-is-followed-by-the-authenticated-user
+// GitHub API docs: https://developer.github.com/v3/users/followers/#check-if-a-user-follows-another-user
+func (s *UsersService) IsFollowing(ctx context.Context, user, target string) (bool, *Response, error) {
+	var u string
+	if user != "" {
+		u = fmt.Sprintf("users/%v/following/%v", user, target)
+	} else {
+		u = fmt.Sprintf("user/following/%v", target)
+	}
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return false, nil, err
+	}
+
+	resp, err := s.client.Do(ctx, req, nil)
+	following, err := parseBoolResponse(err)
+	return following, resp, err
+}
+
+// Follow will cause the authenticated user to follow the specified user.
+//
+// GitHub API docs: https://developer.github.com/v3/users/followers/#follow-a-user
+func (s *UsersService) Follow(ctx context.Context, user string) (*Response, error) {
+	u := fmt.Sprintf("user/following/%v", user)
+	req, err := s.client.NewRequest("PUT", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return s.client.Do(ctx, req, nil)
+}
+
+// Unfollow will cause the authenticated user to unfollow the specified user.
+//
+// GitHub API docs: https://developer.github.com/v3/users/followers/#unfollow-a-user
+func (s *UsersService) Unfollow(ctx context.Context, user string) (*Response, error) {
+	u := fmt.Sprintf("user/following/%v", user)
+	req, err := s.client.NewRequest("DELETE", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return s.client.Do(ctx, req, nil)
+}