Scheduled monthly dependency update for August

requirements_dev.txt

@@ -1,18 +1,18 @@
 -e .
-bump2version==0.5.10
-wheel==0.33.1
-watchdog==0.9.0
-flake8==3.7.7
-tox==3.7.0
-coverage==4.5.2
-Sphinx==1.8.4
+bump2version==1.0.0
+wheel==0.34.2
+watchdog==0.10.3
+flake8==3.8.3
+tox==3.18.1
+coverage==5.2.1
+Sphinx==3.1.2
 # only used for setup script
 # cryptography==1.0.1
-py==1.8.0
-pytest==4.3.0
-PyYAML==3.13
-prospector[with_everything]==1.1.6.2
+py==1.9.0
+pytest==6.0.1
+PyYAML==5.3.1
+prospector[with_everything]==1.3.0
 python-dateutil>=2.6.0
 requests>=2.18
 black>=18.9b0; python_version >= '3.6'
-pyOpenSSL==19.0.0
+pyOpenSSL==19.1.0