[requires.io] dependency update on master branch (#134)

tox.ini

@@ -3,8 +3,8 @@ envlist = py36, py37, pypy, format, mypy, lint, packaging, docs
 
 [testenv]
 deps =
-    pytest==5.0.1
-    pytest-cov==2.7.1
+    pytest==5.2.2
+    pytest-cov==2.8.1
     {env:CI_DEPS:}
     {env:EXTRA_DEPS:}
 passenv = CODECOV_TOKEN CI CI_* TRAVIS TRAVIS_*
@@ -47,7 +47,7 @@ commands = prospector
 
 [testenv:docs]
 basepython = python3.6
-deps = sphinx==2.1.2
+deps = sphinx==2.2.1
 whitelist_externals = make
 changedir = {toxinidir}/docs
 commands =
@@ -57,9 +57,9 @@ commands =
 [testenv:packaging]
 basepython=python3.6
 deps =
-   check-manifest==0.39
+   check-manifest==0.40
    readme-renderer==24.0
-   twine==1.13.0
+   twine==2.0.0
 commands =
    check-manifest
    python setup.py check --metadata --strict