added breaking change in changelog

Author: ANKUR DWIVEDI

README.md

@@ -14,8 +14,14 @@ Javascript SDK for [ImageKit](https://imagekit.io/) provides URL generation for
 
 ImageKit is complete media storage, optimization, and transformation solution that comes with an [image and video CDN](https://imagekit.io/features/imagekit-infrastructure). It can be integrated with your existing infrastructure - storage like AWS S3, web servers, your CDN, and custom domain names, allowing you to deliver optimized images in minutes with minimal code changes.
 
-## Changelog - SDK Version 2.0.0
-### Breaking changes
+## Changelog
+### SDK Version 3.0.0
+#### Breaking changes
+**1. Overlay Syntax update**
+* The old overlay syntax parameters such as `oi`, `ot`, `obg`, and more. These parameters are deprecated and will start returning errors when used in URLs. Please migrate to the new Layers syntax that supports overlay nesting, provides better positional control, and allows more transformations at the layer level. You can start with [examples](https://docs.imagekit.io/features/image-transformations/overlay-using-layers#examples) to learn quickly.
+* You can migrate to the new Layers syntax using the `raw` transformation parameter.
+### SDK Version 2.0.0
+#### Breaking changes
 **1. Authentication Process Update:**
 * Previously, when using client side file upload, the SDK required the `publicKey` and `authenticationEndpoint` parameters during SDK initialization to fetch security parameters (`signature`, `token`, and `expire`).
 * In version 2.0.0, we've updated the authentication process for the SDK. As a user of the SDK, you are now responsible for generating the security parameters (`signature`, `token`, and `expire`) yourself. This means you no longer need to provide the `authenticationEndpoint`. When using the SDK's upload method, make sure to pass these security parameters explicitly along with other [upload options](https://docs.imagekit.io/api-reference/upload-file-api/client-side-file-upload). For guidance on generating these security parameters, please refer to the documentation available [here](https://docs.imagekit.io/api-reference/upload-file-api/client-side-file-upload#signature-generation-for-client-side-file-upload).

test/upload.js

@@ -1182,7 +1182,7 @@ describe("File upload", function () {
       expect(callback.calledOnce).to.be.true;
       sinon.assert.calledWith(callback, null, uploadSuccessResponseObj);
     });
-    it("Should return error for invalid transformation", async function () {
+    it("Should return error for an invalid transformation", async function () {
       const fileOptions = {
         ...securityParameters,
         fileName: "test_file_name",
@@ -1206,7 +1206,7 @@ describe("File upload", function () {
       expect(callback.calledOnce).to.be.true;
       sinon.assert.calledWith(callback, errRes, null);
     });
-    it("Should return error for invalid pre transformation", async function () {
+    it("Should return error for an invalid pre transformation", async function () {
       const fileOptions = {
         ...securityParameters,
         fileName: "test_file_name",
@@ -1230,7 +1230,7 @@ describe("File upload", function () {
       expect(callback.calledOnce).to.be.true;
       sinon.assert.calledWith(callback, errRes, null);
     });
-    it("Should return error for invalid post transformation of type abs", async function () {
+    it("Should return error for an invalid post transformation of type abs", async function () {
       const fileOptions = {
         ...securityParameters,
         fileName: "test_file_name",
@@ -1254,7 +1254,7 @@ describe("File upload", function () {
       expect(callback.calledOnce).to.be.true;
       sinon.assert.calledWith(callback, errRes, null);
     });
-    it("Should return error for invalid post transformation of type transformation", async function () {
+    it("Should return error for an invalid post transformation of type transformation", async function () {
       const fileOptions = {
         ...securityParameters,
         fileName: "test_file_name",
@@ -1278,7 +1278,7 @@ describe("File upload", function () {
       expect(callback.calledOnce).to.be.true;
       sinon.assert.calledWith(callback, errRes, null);
     });
-    it("Should return error for invalid post transformation if not an array", async function () {
+    it("Should return error for an invalid post transformation if it's not an array", async function () {
       const fileOptions = {
         ...securityParameters,
         fileName: "test_file_name",

test/url-generation.js

@@ -268,17 +268,6 @@ describe("URL generation", function () {
         expect(url).equal(`https://ik.imagekit.io/test_url_endpoint/tr:e-contrast/test_path.jpg`);
     });
 
-    it('transformation with defaultImage', function () {
-        const url = imagekit.url({
-            path: "/test_path1.jpg",
-            transformation: [{
-                defaultImage: "/test_path.jpg",
-            }]
-        })
-
-        expect(url).equal(`https://ik.imagekit.io/test_url_endpoint/tr:di-test_path.jpg/test_path1.jpg`);
-    });
-
     it('skip transformation if it is undefined or null', function () {
         const url = imagekit.url({
             path: "/test_path1.jpg",