Move install requirements to setup script

requirements.txt

@@ -1,5 +1,8 @@
 arrow
 bbcode
 blinker
+flake8
 jmespath
+mypy
+pytest
 requests

setup.py

@@ -84,4 +84,11 @@ setup(
     download_url=f'{GITHUB}/archive/{__version__}.tar.gz',
     packages=list(iter_package_names()),
     package_data=dict(iter_package_data()),
+    install_requires=(
+        'arrow',
+        'bbcode',
+        'blinker',
+        'jmespath',
+        'requests',
+    ),
 )

tox.ini

@@ -7,15 +7,11 @@ python =
     3.6: py36
 
 [testenv]
+deps = -rrequirements.txt
 commands =
     py.test
     flake8 fimfarchive tests
     mypy --ignore-missing-imports fimfarchive
-deps =
-    -rrequirements.txt
-    pytest
-    flake8
-    mypy
 
 [pytest]
 addopts =