Updated lint rules

src/file/drawing/inline/graphic/graphic-data/pic/pic.ts

@@ -6,7 +6,7 @@ import { PicAttributes } from "./pic-attributes";
 import { ShapeProperties } from "./shape-properties/shape-properties";
 
 export class Pic extends XmlComponent {
-    private shapeProperties: ShapeProperties;
+    private readonly shapeProperties: ShapeProperties;
 
     constructor(referenceId: number, x: number, y: number) {
         super("pic:pic");

src/file/drawing/inline/graphic/graphic-data/pic/shape-properties/form/extents/extents.ts

@@ -3,7 +3,7 @@ import { XmlComponent } from "file/xml-components";
 import { ExtentsAttributes } from "./extents-attributes";
 
 export class Extents extends XmlComponent {
-    private attributes: ExtentsAttributes;
+    private readonly attributes: ExtentsAttributes;
 
     constructor(x: number, y: number) {
         super("a:ext");

src/file/drawing/inline/graphic/graphic-data/pic/shape-properties/form/form.ts

@@ -4,7 +4,7 @@ import { Extents } from "./extents/extents";
 import { Offset } from "./offset/off";
 
 export class Form extends XmlComponent {
-    private extents: Extents;
+    private readonly extents: Extents;
 
     constructor(x: number, y: number) {
         super("a:xfrm");

src/file/drawing/inline/graphic/graphic-data/pic/shape-properties/shape-properties.ts

@@ -7,7 +7,7 @@ import { PresetGeometry } from "./preset-geometry/preset-geometry";
 import { ShapePropertiesAttributes } from "./shape-properties-attributes";
 
 export class ShapeProperties extends XmlComponent {
-    private form: Form;
+    private readonly form: Form;
 
     constructor(x: number, y: number) {
         super("pic:spPr");