fix: removed GET with body from result() call and replaced with POST …

[Sreini]

…to prepare for deprecation of GET with body from API.

[Copilot]

Pull Request Overview

This PR updates the Tinify API client to replace HTTP GET requests with request body with POST requests to prepare for the deprecation of GET with body from the API. The change maintains existing functionality while adapting to upcoming API changes.

• Modified the result() method to conditionally use GET (when no commands) or POST (when commands are present)
• Updated all test files to mock POST requests instead of GET requests when a request body is involved
• Incremented package version to 1.8.2 and added changelog entry

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/tinify/Source.ts	Updated result() method to use POST when commands are present, GET when no commands
test/tinify-test.js	Updated test mocks from GET to POST for requests with body
test/tinify-source-test.js	Updated test mocks from GET to POST for requests with body
package.json	Version bump to 1.8.2
CHANGES.md	Added changelog entry for version 1.8.2

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