Add test cases

[imagekitio]

Add URL-generation and upload test cases like - https://github.com/imagekit-developer/imagekit-javascript/tree/master/test

[aortiz24]

I'll add the test cases, if you assign them to me!

[imagekitio]

@aortiz24 Assigned to you.

You can start by writing a few URL generation test cases and submit a PR so that I can quickly review before you write the rest of them.

For the complete list of test cases to cover for URL-generation, please refer to JS SDK.

I am here to help if you any questions or doubts.

[imagekitio]

@aortiz24

Here is an update:
The test case for URL generation has been added to the master branch. You can pick up the upload test cases. Please use nock to mock network requests.

[imagekitio]

Fixed in v 3.1.1