Merge pull request #753 from helgi/coverage_41

chore(requirements): update coverage to 4.1

Author: helgi

rootfs/dev_requirements.txt

@@ -1,5 +1,5 @@
 # Run "make coverage" or "make test-unit" for the % of code exercised during tests
-coverage==4.0.3
+coverage==4.1.0
 
 # Run "make flake8" to check python syntax and style
 flake8==2.5.4