Added sticker support to client

[furkansarihan]

Sticker support with an optional boolean parameter for "search", "trending", "random" endpoints.

[kozw]

Any chance this PR can make it in a new release?

[furkansarihan]

@kozw author not seem active.

I am using the package like this and you can too. You can also use it from your fork for reliability.

giphy_client:
    git:
        url: https://github.com/furkansarihan/giphy_client.git
        ref: 5c31aaf761f210cb156d6d6b3e31865d6aedcca9

[kozw]

Thanks, I did not know about git dependencies, that's pretty neat!

Too bad the original package is no longer maintained, really like this package.