Add start and end column to Annotation (google#1241)

Author: mcristina422

github/checks.go

@@ -54,6 +54,8 @@ type CheckRunAnnotation struct {
 	BlobHRef        *string `json:"blob_href,omitempty"`
 	StartLine       *int    `json:"start_line,omitempty"`
 	EndLine         *int    `json:"end_line,omitempty"`
+	StartColumn     *int    `json:"start_column,omitempty"`
+	EndColumn       *int    `json:"end_column,omitempty"`
 	AnnotationLevel *string `json:"annotation_level,omitempty"`
 	Message         *string `json:"message,omitempty"`
 	Title           *string `json:"title,omitempty"`

github/checks_test.go

@@ -151,6 +151,8 @@ func TestChecksService_ListCheckRunAnnotations(t *testing.T) {
 		                           "blob_href": "https://github.com/octocat/Hello-World/blob/837db83be4137ca555d9a5598d0a1ea2987ecfee/README.md",
 		                           "start_line": 2,
 		                           "end_line": 2,
+		                           "start_column": 1,
+		                           "end_column": 5,									
 		                           "annotation_level": "warning",
 		                           "message": "Check your spelling for 'banaas'.",
                                            "title": "Spell check",
@@ -168,10 +170,12 @@ func TestChecksService_ListCheckRunAnnotations(t *testing.T) {
 		BlobHRef:        String("https://github.com/octocat/Hello-World/blob/837db83be4137ca555d9a5598d0a1ea2987ecfee/README.md"),
 		StartLine:       Int(2),
 		EndLine:         Int(2),
+		StartColumn:     Int(1),
+		EndColumn:       Int(5),
 		AnnotationLevel: String("warning"),
 		Message:         String("Check your spelling for 'banaas'."),
-		RawDetails:      String("Do you mean 'bananas' or 'banana'?"),
 		Title:           String("Spell check"),
+		RawDetails:      String("Do you mean 'bananas' or 'banana'?"),
 	}}
 
 	if !reflect.DeepEqual(checkRunAnnotations, want) {