Bump py from 1.8.0 to 1.10.0 in /requirements

requirements/dev-requirements.txt

@@ -4,20 +4,39 @@
 #
 #    pip-compile dev-requirements.in
 #
-appdirs==1.4.3            # via black
-atomicwrites==1.3.0       # via pytest
-attrs==19.2.0             # via black, pytest
+appdirs==1.4.3
+    # via black
+atomicwrites==1.3.0
+    # via pytest
+attrs==19.2.0
+    # via
+    #   black
+    #   pytest
 black==19.3b0
-click==7.0                # via black, pip-tools
-importlib-metadata==0.23  # via pluggy, pytest
-more-itertools==7.2.0     # via pytest, zipp
-packaging==19.2           # via pytest
+    # via -r dev-requirements.in
+click==7.0
+    # via
+    #   black
+    #   pip-tools
+more-itertools==7.2.0
+    # via pytest
+packaging==19.2
+    # via pytest
 pip-tools==4.2.0
-pluggy==0.13.0            # via pytest
-py==1.8.0                 # via pytest
-pyparsing==2.4.2          # via packaging
+    # via -r dev-requirements.in
+pluggy==0.13.0
+    # via pytest
+py==1.10.0
+    # via pytest
+pyparsing==2.4.2
+    # via packaging
 pytest==5.2.1
-six==1.12.0               # via packaging, pip-tools
-toml==0.10.0              # via black
-wcwidth==0.1.7            # via pytest
-zipp==0.6.0               # via importlib-metadata
+    # via -r dev-requirements.in
+six==1.12.0
+    # via
+    #   packaging
+    #   pip-tools
+toml==0.10.0
+    # via black
+wcwidth==0.1.7
+    # via pytest