Fixing PSR-4 Autoloading Issue in Probots\Pinecone\Requests\Exceptions\MissingNameException

[ianfortier]

This pull request resolves the PSR-4 autoloading issue for the MissingNameException class in the Probots\Pinecone\Requests\Exceptions namespace.

Class Probots\Pinecone\Requests\Exceptions\MissingNameException located in 
(...)/vendor/probots-io/pinecone-php/src\Exceptions\MissingNameException.php
does not comply with psr-4 autoloading standard. Skipping.

I have updated the namespace to Probots\Pinecone\Exceptions to align with the folder structure.

[derpoho]

thanks @ianfortier