Replace requirements.txt with pipenv

Author: SimmonsRitchie

Pipfile

@@ -0,0 +1,21 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+jsonschema = ">=3.0.0a5"
+pytz = "*"
+requests = "*"
+scrapy = "*"
+
+[dev-packages]
+black = "*"
+flake8 = "*"
+pytest = "*"
+isort = "*"
+build = "*"
+twine = "*"
+
+[requires]
+python_version = "3.8"