let's see if this works

Makefile

@@ -1,15 +1,16 @@
 .PHONY: docs
 
 init:
-	pip install -r requirements.txt
+	pip install pipenv>=0.1.6
+	pipenv install --dev
 
 test:
 	# This runs all of the tests. To run an individual test, run py.test with
 	# the -k flag, like "py.test -k test_path_is_not_double_encoded"
-	py.test tests
+	pipenv run py.test tests
 
 coverage:
-	py.test --cov-config .coveragerc --verbose --cov-report term --cov-report xml --cov=requests tests
+	pipenv run py.test --cov-config .coveragerc --verbose --cov-report term --cov-report xml --cov=requests tests
 
 certs:
 	curl http://ci.kennethreitz.org/job/ca-bundle/lastSuccessfulBuild/artifact/cacerts.pem -o requests/cacert.pem

Pipfile

@@ -0,0 +1,12 @@
+[[source]]
+url = "https://pypi.org/"
+verify_ssl = true
+
+[dev-packages]
+sphinx = "*"
+pytest-mock = "*"
+pytest-cov = "*"
+pytest = "*"
+codecov = "*"
+pytest-httpbin = "*"
+PySocks = "*"