[requires.io] dependency update

Author: requires

requirements.txt

@@ -23,7 +23,7 @@ MarkupSafe==1.1.0          # via jinja2
 mccabe==0.6.1
 pep8-naming==0.7.0
 pep8==1.7.1
-prospector==1.1.6
+prospector==1.1.6.1
 pycodestyle==2.4.0        # via prospector
 pydocstyle==3.0.0
 pyflakes==2.0.0