Due to the live_server_scope option, require pytest>=5.2

The fixture uses the dynamic fixture support introduced in pytest 5.2:

https://github.com/pytest-dev/pytest/blob/master/doc/en/changelog.rst#pytest-520-2019-09-28

Author: nicoddemus

requirements/main.txt

@@ -1,3 +1,3 @@
-pytest>=3.6
+pytest>=5.2
 Flask
 Werkzeug>=0.7

setup.py

@@ -115,7 +115,7 @@ def read(*parts):
         return ''
 
 
-requirements = read('requirements', 'main.txt').splitlines() + ['pytest']
+requirements = read('requirements', 'main.txt').splitlines()
 tests_require = []
 
 extras_require = {