Merge pull request #1588 from rachmadaniHaryono/feature/fix-nose-coverage

install coverage_plugin of nose2 instead of coverage-plugin

requirements-dev.txt

@@ -1,6 +1,6 @@
 babel==2.3.4
 mock==2.0.0
-nose2[coverage-plugin]
+nose2[coverage_plugin]
 cov-core==1.15.0
 pep8==1.7.0
 plone.testing==5.0.0