Update pip from 10.0.1 to 18.0

pyup-bot · pyup-bot · commit c4f46947995c · 2018-07-22T17:53:34.000+02:00
diff --git a/requirements_dev.txt b/requirements_dev.txt
@@ -1,4 +1,4 @@
-pip==10.0.1
+pip==18.0
 bumpversion==0.5.3
 wheel==0.31.1
 watchdog==0.8.3
