feat: add support for DigitalOcean

This commit adds a x-amz-date header which is an undocumented
requirement of DO API requests.

simples3.go

@@ -309,6 +309,7 @@ func (s3 *S3) signRequest(req *http.Request) error {
 		}
 	}
 	req.Header.Set("Date", t.Format(amzDateISO8601TimeFormat))
+	req.Header.Set("X-Amz-Date", t.Format(amzDateISO8601TimeFormat))
 
 	// The x-amz-content-sha256 header is required for all AWS
 	// Signature Version 4 requests. It provides a hash of the

simples3_test.go

@@ -155,7 +155,7 @@ func TestS3_FileUploadPostAndPut(t *testing.T) {
 				})
 
 				if (err != nil) != tt.wantErr {
-					t.Errorf("S3.FileUpload() error = %v, wantErr %v", err, tt.wantErr)
+					t.Errorf("S3.FileDetails() error = %v, wantErr %v", err, tt.wantErr)
 				}
 
 				if len(dResp.AmzMeta) != len(tt.args.u.CustomMetadata) {