Update python versions, unpin selenium.

Author: tillahoffmann

setup.py

@@ -20,10 +20,8 @@
     name='testcontainers',
     packages=setuptools.find_packages(exclude=['tests']),
     version='2.5.0',
-    description=('Library provides lightweight, throwaway '
-                 'instances of common databases, '
-                 'Selenium web browsers, or anything else that can '
-                 'run in a Docker container'),
+    description='Library provides lightweight, throwaway instances of common databases, Selenium '
+                'web browsers, or anything else that can run in a Docker container',
     author='Sergey Pirogov',
     author_email='[email protected]',
     url='https://github.com/testcontainers/testcontainers-python',
@@ -32,9 +30,12 @@
         'License :: OSI Approved :: Apache Software License',
         'Intended Audience :: Information Technology',
         'Intended Audience :: Developers',
-        'Programming Language :: Python :: 3.4',
-        'Topic :: Software Development :: '
-        'Libraries :: Python Modules',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+        'Topic :: Software Development :: Libraries :: Python Modules',
         'Operating System :: Microsoft :: Windows',
         'Operating System :: POSIX',
         'Operating System :: Unix',
@@ -51,10 +52,11 @@
         'mysql': ['sqlalchemy', 'pymysql'],
         'oracle': ['sqlalchemy', 'cx_Oracle'],
         'postgresql': ['sqlalchemy', 'psycopg2-binary'],
-        'selenium': ['selenium==2.53.1'],
+        'selenium': ['selenium'],
         'google-cloud-pubsub': ['google-cloud-pubsub'],
         'mongo': ['pymongo']
     },
     long_description_content_type="text/markdown",
     long_description=long_description,
+    python_requires='~=3.5',
 )