build: fix activities with the same code
build: fix activities with the same code

This fixes an issue that could arise when dealing with
companies activities. It is possible to have multiple
activities with the same code but different descriptions.

Closes #17.

Signed-off-by: Vinicius Kwiecien Ruoso <49338e97bd9d901da0d4abfb5c8d7f1a8832af56@gmail.com>

vkruoso/receita-tools