Simplify `mypy` config (#45)

Instead of specifying stricter checks one by one, just run `mypy` in
`strict` mode.

modified:   tox.ini

tox.ini

@@ -52,8 +52,8 @@ deps =
 	mypy
 commands =
 	-mypy \
+	    --strict \
 		--show-error-context \
-		--config-file {toxinidir}/tox.ini \
 		--html-report {env:MYPYHTML}.py3.{envname} \
 		{posargs:{env:SSHAUDIT}}
 
@@ -86,24 +86,6 @@ commands =
 		print(b'\n'.join(l).decode('utf-8')); \
 		sys.exit(1 if len(l) > 0 else 0)"
 
-
-[mypy]
-ignore_missing_imports = False
-follow_imports = normal
-disallow_incomplete_defs = True
-disallow_untyped_calls = True
-disallow_untyped_decorators = True
-disallow_untyped_defs = True
-check_untyped_defs = True
-disallow_subclassing_any = True
-warn_redundant_casts = True
-warn_return_any = True
-warn_unreachable = True
-warn_unused_ignores = True
-strict_optional = True
-strict_equality = True
-strict = True
-
 [pylint]
 reports = no
 #output-format = colorized