[requires.io] dependency update

Author: requires

requirements.txt

@@ -23,7 +23,7 @@ MarkupSafe==1.0          # via jinja2
 mccabe==0.6.1
 pep8-naming==0.4.1
 pep8==1.7.0
-prospector==0.12.6
+prospector==0.12.7
 pycodestyle==2.3.1        # via prospector
 pydocstyle==2.0.0
 pyflakes==1.5.0