chore: add python 3.13

Author: tiwarishubham635

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py27, py34, py35, py36, py37, py312
+envlist = py27, py34, py35, py36, py37, py38, py39, py310, py311, py312, py313
 
 [testenv]
 commands = coverage erase
@@ -40,7 +40,32 @@ commands = {[testenv]commands}
 deps = {[testenv]deps}
 basepython = python3.7
 
+[testenv:py38]
+commands = {[testenv]commands}
+deps = {[testenv]deps}
+basepython = python3.8
+
+[testenv:py39]
+commands = {[testenv]commands}
+deps = {[testenv]deps}
+basepython = python3.9
+
+[testenv:py310]
+commands = {[testenv]commands}
+deps = {[testenv]deps}
+basepython = python3.10
+
+[testenv:py311]
+commands = {[testenv]commands}
+deps = {[testenv]deps}
+basepython = python3.11
+
 [testenv:py312]
 commands = {[testenv]commands}
 deps = {[testenv]deps}
 basepython = python3.12
+
+[testenv:py313]
+commands = {[testenv]commands}
+deps = {[testenv]deps}
+basepython = python3.13