Removed python version required - not mandatory for now (#12)

Author: liranbg

Makefile

@@ -38,7 +38,7 @@ install_pipenv:
 	python -m pip install --user pipenv
 	python -m pipenv --python ${PIPENV_PYTHON_VERSION}
 ifeq ($(PIPENV_PYTHON_VERSION), 2.7)
-	python -m pipenv install -r requirements.py2.txt
+	python -m pipenv install --ignore-pipfile --skip-lock --requirements requirements.py2.txt
 else
 	python -m pipenv install --dev
 endif

Pipfile

@@ -11,9 +11,6 @@ flake8 = "*"
 twine = "*"
 bleach = "==3.1.1"
 
-[requires]
-python_version = "3.7"
-
 [scripts]
 build = "python setup.py sdist bdist_wheel"
 test = "python -m unittest discover -s nuclio_sdk/test -p 'test_*.py' -v"