Added support for searching by UPC

Updated the library to support searching by unique product code (barcode) and updated unit test.

Signed-off-by: Michael James <michael.james6@gmail.com>
Merge branch 'master' of https://github.com/MichaelJames6/BreweryDBSDK
Merge branch 'master' of https://github.com/MichaelJames6/BreweryDBSDK

Signed-off-by: Michael James <michael.james6@gmail.com>

Conflicts:
	README.md
API Features

Signed-off-by: Michael James <michael.james6@gmail.com>