Add orjson and mock

pyproject.toml:
Add orjson to the list of dependencies.
Add mock to the list of development dependencies.

pyproject.toml

@@ -13,6 +13,7 @@ packages = [
 python = "^3.9"
 pyalpm = "^0.9.2"
 pydantic = "^1.8.1"
+orjson = "^3.5.1"
 
 [tool.poetry.dev-dependencies]
 tox = "^3.23.0"
@@ -22,6 +23,7 @@ mypy = "^0.812"
 flake8 = "^3.8.4"
 black = "^20.8b1"
 coverage = "^5.5"
+mock = "^4.0.3"
 
 [tool.black]
 line-length = 120