test: Add linters in tox.ini

Author: Mukundan314

tox.ini

@@ -4,10 +4,32 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py36,py37
+envlist = py36, py37, flake8, pylint
+skip_missing_interpreters = true
 
 [testenv]
 deps =
     pytest
 commands =
     pytest
+
+[testenv:flake8]
+basepython = python
+skip_install = true
+deps =
+    flake8
+    flake8-docstrings>=0.2.7
+    flake8-import-order>=0.9
+    pep8-naming
+    flake8-colors
+commands =
+    flake8 {toxinidir}/codeforces/ {toxinidir}/test/ {toxinidir}/setup.py
+
+[testenv:pylint]
+basepython = python
+skip_install = true
+deps =
+    pylint
+    -r{toxinidir}/requirements.txt
+commands =
+    pylint {toxinidir}/codeforces/