func (s *ReactionsService) ListIssueCommentReactions(ctx context.Context, owner, repo string, id int64, opts *ListOptions) ([]*Reaction, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/issues/comments/%v/reactions", owner, repo, id)
	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
	}
	req.Header.Set("Accept", mediaTypeReactionsPreview)
	var m []*Reaction
	resp, err := s.client.Do(ctx, req, &m)
	if err != nil {
		return nil, resp, err
	}
	return m, resp, nil
}
ListIssueCommentReactions lists the reactions for an issue comment.

GitHub API docs: https://developer.github.com/v3/reactions/#list-reactions-for-an-issue-comment
package github
import (
	"context"
	"fmt"
	"net/http"
)
type ReactionsService service
type Reaction struct {
	ID     *int64  `json:"id,omitempty"`
	User   *User   `json:"user,omitempty"`
	NodeID *string `json:"node_id,omitempty"`
	Content *string `json:"content,omitempty"`
}
type Reactions struct {
	TotalCount *int    `json:"total_count,omitempty"`
	PlusOne    *int    `json:"+1,omitempty"`
	MinusOne   *int    `json:"-1,omitempty"`
	Laugh      *int    `json:"laugh,omitempty"`
	Confused   *int    `json:"confused,omitempty"`
	Heart      *int    `json:"heart,omitempty"`
	Hooray     *int    `json:"hooray,omitempty"`
	URL        *string `json:"url,omitempty"`
}
func (r Reaction) String() string {
	return Stringify(r)
}
type ListCommentReactionOptions struct {
	Content string `url:"content,omitempty"`
	ListOptions
}
func (s *ReactionsService) ListCommentReactions(ctx context.Context, owner, repo string, id int64, opts *ListCommentReactionOptions) ([]*Reaction, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/comments/%v/reactions", owner, repo, id)
	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
	}
	req.Header.Set("Accept", mediaTypeReactionsPreview)
	var m []*Reaction
	resp, err := s.client.Do(ctx, req, &m)
	if err != nil {
		return nil, resp, err
	}
	return m, resp, nil
}
func (s ReactionsService) CreateCommentReaction(ctx context.Context, owner, repo string, id int64, content string) (*Reaction, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/comments/%v/reactions", owner, repo, id)
	body := &Reaction{Content: String(content)}
	req, err := s.client.NewRequest("POST", u, body)
	if err != nil {
		return nil, nil, err
	}
	req.Header.Set("Accept", mediaTypeReactionsPreview)
	m := &Reaction{}
	resp, err := s.client.Do(ctx, req, m)
	if err != nil {
		return nil, resp, err
	}
	return m, resp, nil
}
func (s *ReactionsService) DeleteCommentReaction(ctx context.Context, owner, repo string, commentID, reactionID int64) (*Response, error) {
	u := fmt.Sprintf("repos/%v/%v/comments/%v/reactions/%v", owner, repo, commentID, reactionID)
	return s.deleteReaction(ctx, u)
}
func (s *ReactionsService) DeleteCommentReactionByID(ctx context.Context, repoID, commentID, reactionID int64) (*Response, error) {
	u := fmt.Sprintf("repositories/%v/comments/%v/reactions/%v", repoID, commentID, reactionID)
	return s.deleteReaction(ctx, u)
}
func (s *ReactionsService) ListIssueReactions(ctx context.Context, owner, repo string, number int, opts *ListOptions) ([]*Reaction, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/issues/%v/reactions", owner, repo, number)
	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
	}
	req.Header.Set("Accept", mediaTypeReactionsPreview)
	var m []*Reaction
	resp, err := s.client.Do(ctx, req, &m)
	if err != nil {
		return nil, resp, err
	}
	return m, resp, nil
}
func (s ReactionsService) CreateIssueReaction(ctx context.Context, owner, repo string, number int, content string) (*Reaction, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/issues/%v/reactions", owner, repo, number)
	body := &Reaction{Content: String(content)}
	req, err := s.client.NewRequest("POST", u, body)
	if err != nil {
		return nil, nil, err
	}
	req.Header.Set("Accept", mediaTypeReactionsPreview)
	m := &Reaction{}
	resp, err := s.client.Do(ctx, req, m)
	if err != nil {
		return nil, resp, err
	}
	return m, resp, nil
}
func (s *ReactionsService) DeleteIssueReaction(ctx context.Context, owner, repo string, issueNumber int, reactionID int64) (*Response, error) {
	url := fmt.Sprintf("repos/%v/%v/issues/%v/reactions/%v", owner, repo, issueNumber, reactionID)
	return s.deleteReaction(ctx, url)
}
func (s *ReactionsService) DeleteIssueReactionByID(ctx context.Context, repoID, issueNumber int, reactionID int64) (*Response, error) {
	url := fmt.Sprintf("repositories/%v/issues/%v/reactions/%v", repoID, issueNumber, reactionID)
	return s.deleteReaction(ctx, url)
}