fix: Unable to test on python versions < 3.6; don't claim support

README.md

@@ -122,7 +122,7 @@ It converts a set of input images into a new, much larger set of slightly altere
 
 ## Installation
 
-The library supports python 2.7 and 3.4+.
+The library supports python 3.6+.
 
 ### Installation: Anaconda
 

setup.py

@@ -17,20 +17,17 @@
     "scikit-image>=0.14.2,<0.17",
     "opencv-python-headless<4",
     "opencv-python<4",
-    "imageio<=2.6.1; python_version<'3.5'",
-    "imageio; python_version>='3.5'",
+    "imageio",
     "Shapely",
-    "imagecorruptions; python_version>='3.5'", # requires scikit-image 15+ which requires python>=3.5
+    "imagecorruptions",
 ]
 
 ALT_INSTALL_REQUIRES = {
     "opencv-python-headless": ["opencv-python", "opencv-contrib-python", "opencv-contrib-python-headless"],
 }
 
 DEV_REQUIRES = [
-    "pytest-subtests; python_version >= '3.4'",
-    "mock; python_version < '3.3'", # unittest.mock does not exist in older versions
-    "unittest2; python_version < '3.4'",  # in 3.4, self.subTest was added
+    "pytest-subtests",
     "xdoctest >= 0.7.2",
 ]
 
@@ -72,6 +69,7 @@ def get_install_requirements(main_requires, alternative_requires):
     author_email="[email protected]",
     url="https://github.com/aleju/imgaug",
     download_url="https://github.com/aleju/imgaug/archive/0.4.0.tar.gz",
+    python_requires='>3.5',
     install_requires=INSTALL_REQUIRES,
     extras_require={
         'dev': DEV_REQUIRES,
@@ -96,10 +94,7 @@ def get_install_requirements(main_requires, alternative_requires):
         "License :: OSI Approved :: MIT License",
         "Natural Language :: English",
         "Operating System :: OS Independent",
-        "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.4",
-        "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",