fix dependencies

requirements/base.txt

@@ -1,4 +1,4 @@
 aiohttp>=3.5.4
-async-timeout>=3.0.1
 aiodns>=2.0.0
+attrs==19.1.0
 maxminddb>=1.4.1

setup.py

@@ -12,19 +12,22 @@
     INFO['long_description'] = f.read()
 
 REQUIRES = [
-    'aiohttp>=3.5.4' 'async-timeout>=3.0.1' 'aiodns>=2.0.0' 'maxminddb>=1.4.1'
+    'aiohttp>=3.5.4',
+    'aiodns>=2.0.0',
+    'attrs==19.1.0',
+    'maxminddb>=1.4.1',
 ]
 SETUP_REQUIRES = ['pytest-runner>=4.4']
 TEST_REQUIRES = [
-    'black>=18.9-beta.0'
-    'flake8>=3.7'
-    'isort>=4.3'
-    'pytest>=4.3'
-    'pytest-asyncio>=0.10'
-    'pytest-runner>=4.4'
-    'pytest-isort>=0.3'
-    'pytest-flake8>=1.0'
-    'pytest-mock>=1.10.1'
+    # 'black>=18.9-beta.0',
+    'flake8>=3.7',
+    'isort>=4.3',
+    'pytest>=4.3',
+    'pytest-asyncio>=0.10',
+    'pytest-runner>=4.4',
+    'pytest-isort>=0.3',
+    'pytest-flake8>=1.0',
+    'pytest-mock>=1.10.1',
 ]
 PACKAGES = ['proxybroker', 'proxybroker.data']
 PACKAGE_DATA = {'': ['LICENSE'], INFO['package']: ['data/*.mmdb']}
@@ -44,6 +47,7 @@
     packages=PACKAGES,
     package_data=PACKAGE_DATA,
     platforms='any',
+    python_requires='>=3.5.3',
     entry_points={'console_scripts': ['proxybroker = proxybroker.cli:cli']},
     classifiers=[
         'Development Status :: 5 - Production/Stable',