Revert "Drop support to old pytest versions (<3.4)"

This reverts commit b5abe791ad.

.travis.yml

@@ -17,9 +17,10 @@ python:
 - '3.5'
 - '3.6'
 env:
-- TOXENV=py-pytest34
-- TOXENV=py-pytest35
-- TOXENV=py-pytest36
+- TOXENV=py-pytest30
+- TOXENV=py-pytest31
+- TOXENV=py-pytest32
+- TOXENV=py-pytest33
 
 install: pip install tox setuptools_scm
 script: tox

appveyor.yml

@@ -1,21 +1,22 @@
 environment:
   matrix:
-  - TOXENV: "py27-pytest36"
-  - TOXENV: "py34-pytest36"
-  - TOXENV: "py35-pytest36"
-  - TOXENV: "py36-pytest36"
-  - TOXENV: "py27-pytest36-pexpect"
-  - TOXENV: "py36-pytest36-pexpect"
+  # note: please use "tox --listenvs" to populate the build matrix
+  - TOXENV: "py27-pytest33"
+  - TOXENV: "py34-pytest33"
+  - TOXENV: "py35-pytest33"
+  - TOXENV: "py36-pytest33"
+  - TOXENV: "py27-pytest33-pexpect"
+  - TOXENV: "py36-pytest33-pexpect"
   - TOXENV: "flakes"
   - TOXENV: "readme"
 
 install:
-  - C:\Python36\python -m pip install -U tox setuptools_scm pip
+  - C:\Python35\python -m pip install -U tox setuptools_scm pip
 
 build: false  # Not a C# project, build stuff at the test step instead.
 
 test_script:
-  - C:\Python36\python -m tox
+  - C:\Python35\python -m tox
 
 # We don't deploy anything on tags with AppVeyor, we use Travis instead, so we
 # might as well save resources

setup.py

@@ -1,6 +1,6 @@
 from setuptools import setup, find_packages
 
-install_requires = ['execnet>=1.1', 'pytest>=3.4', 'pytest-forked']
+install_requires = ['execnet>=1.1', 'pytest>=3.0.0', 'pytest-forked']
 
 
 setup(

tox.ini

@@ -1,8 +1,8 @@
 [tox]
 # if you change the envlist, please update .travis.yml file as well
 envlist=
-  py{27,34,35,36}-pytest{34,35,36}
-  py{27,36}-pytest36-pexpect
+  py{27,34,35,36}-pytest{30,31,32,33}
+  py{27,36}-pytest{30,31,32,33}-pexpect
   py{27,36}-pytest{master,features}
   flakes
   readme
@@ -15,9 +15,10 @@ deps =
   pycmd
   # to avoid .eggs
   setuptools_scm
-  pytest34: pytest~=3.4.0
-  pytest35: pytest~=3.5.0
-  pytest36: pytest~=3.6.0
+  pytest30: pytest~=3.0.5
+  pytest31: pytest~=3.1.0
+  pytest32: pytest~=3.2.0
+  pytest33: pytest~=3.3.0
   pytestmaster: git+https://github.com/pytest-dev/pytest.git@master
   pytestfeatures: git+https://github.com/pytest-dev/pytest.git@features
   pexpect: pexpect