diff --git a/requirements-dev.txt b/requirements-dev.txt
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--- /dev/null
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+-i https://pypi.org/simple
+atomicwrites==1.3.0
+attrs==19.1.0
+importlib-metadata==0.18
+more-itertools==7.2.0
+packaging==19.0
+pluggy==0.12.0
+py==1.8.0
+pyparsing==2.4.1.1
+pytest==5.0.1
+six==1.12.0
+wcwidth==0.1.7
+zipp==0.5.2