Update dependencies

Author: pensivebrian

requirements-dev.txt

@@ -1,26 +1,25 @@
 applicationinsights >= 0.11.1
-argparse >= 1.2.1
 enum34 >= 1.1.6
 future >= 0.16.0
 setuptools >= 36.0.1
 wheel >= 0.29.0
-coverage >= 4.3.4, < 5.0
+coverage >= 5.2.1
 twine >= 1.11.0
 bumpversion >= 0.5.3 
 tox >= 2.7.0
 flake8 >= 3.3.0
 pytest >= 4.6.5
-pytest-cov >= 2.5.1
+pytest-cov >= 2.11.1
 pytest-timeout >= 1.3.3
 pylint >= 1.9.5
 docutils >= 0.13.1
 azure-storage == 0.36.0
 click >= 4.1, < 7.1
 Pygments >= 2.0
-prompt_toolkit>= 2.0.0 , < 2.1.0
-sqlparse >=0.2.2,<0.3.0
+prompt_toolkit >= 2.0.6 , < 4.0.0
+sqlparse >= 0.3.0,<0.5
 configobj >= 5.0.6
 humanize >= 0.5.1
-cli_helpers >= 0.2.3, < 1.0.0
+cli_helpers[styles] >= 2.0.0
 mock>=1.0.1
 polib>=1.1.0

setup.py

@@ -28,13 +28,12 @@ def get_timestamped_version(ver):
 
 install_requirements = [
     'click >= 4.1,<7.1',
-    'argparse >= 1.2.1',
     'Pygments >= 2.0',  # Pygments has to be Capitalcased.
-    'prompt_toolkit >= 2.0.0 , < 2.1.0',
-    'sqlparse >=0.2.2,<0.3.0',
+    'prompt_toolkit>=2.0.6,<4.0.0',
+    'sqlparse >=0.3.0,<0.5',
     'configobj >= 5.0.6',
     'humanize >= 0.5.1',
-    'cli_helpers >= 0.2.3, < 1.0.0',
+    'cli_helpers[styles] >= 2.0.0'
     'applicationinsights>=0.11.1',
     'future>=0.16.0',
     'wheel>=0.29.0',
@@ -60,6 +59,7 @@ def get_timestamped_version(ver):
     long_description_content_type='text/markdown',
     install_requires=install_requirements,
     include_package_data=True,
+    python_requires=">=3.6",
     scripts=[
         'mssql-cli.bat',
         'mssql-cli'
@@ -69,13 +69,11 @@ def get_timestamped_version(ver):
         'License :: OSI Approved :: BSD License',
         'Operating System :: Unix',
         'Programming Language :: Python',
-        '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',
+        'Programming Language :: Python :: 3.9',
         'Programming Language :: SQL',
         'Topic :: Database',
         'Topic :: Database :: Front-Ends',