Update go-github library

vendor/github.com/google/go-github/github/git_blobs.go

@@ -6,6 +6,7 @@
 package github
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 )
@@ -17,9 +18,10 @@ type Blob struct {
 	SHA      *string `json:"sha,omitempty"`
 	Size     *int    `json:"size,omitempty"`
 	URL      *string `json:"url,omitempty"`
+	NodeID   *string `json:"node_id,omitempty"`
 }
 
-// GetBlob fetchs a blob from a repo given a SHA.
+// GetBlob fetches a blob from a repo given a SHA.
 //
 // GitHub API docs: https://developer.github.com/v3/git/blobs/#get-a-blob
 func (s *GitService) GetBlob(ctx context.Context, owner string, repo string, sha string) (*Blob, *Response, error) {
@@ -34,6 +36,23 @@ func (s *GitService) GetBlob(ctx context.Context, owner string, repo string, sha
 	return blob, resp, err
 }
 
+// GetBlobRaw fetches a blob's contents from a repo.
+// Unlike GetBlob, it returns the raw bytes rather than the base64-encoded data.
+//
+// GitHub API docs: https://developer.github.com/v3/git/blobs/#get-a-blob
+func (s *GitService) GetBlobRaw(ctx context.Context, owner, repo, sha string) ([]byte, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/git/blobs/%v", owner, repo, sha)
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	req.Header.Set("Accept", "application/vnd.github.v3.raw")
+
+	var buf bytes.Buffer
+	resp, err := s.client.Do(ctx, req, &buf)
+	return buf.Bytes(), resp, err
+}
+
 // CreateBlob creates a blob object.
 //
 // GitHub API docs: https://developer.github.com/v3/git/blobs/#create-a-blob