FIX(tox) coverage

tox.ini

@@ -1,24 +1,22 @@
 [tox]
-envlist = check,py36,py37,flake8
+envlist = check,py36,py37,flake8,coverage-report
 
 [testenv]
-commands = pytest -vvv
+commands = pytest
 deps =
   -rrequirements.txt
-
   pytest-pep8
   pytest-cov
-  pytest
-  coverage
 setenv =
     PYTHONPATH={toxinidir}/tests
     PYTHONUNBUFFERED=yes
+
 [testenv:flake8]
 commands = flake8 .
 deps = flake8
 
 [pytest]
-addopts = -s -vvv
+addopts = -s -vvv --cov=fmfexporter --cov=examples --cov=bin
 testpaths = tests
 python_files = tests/*.py
 python_functions = test_
@@ -35,6 +33,7 @@ exclude =
     .tox,
     .eggs,
     *.egg
+skip_install = true
 commands = flake8 .
 deps = flake8
 max-line-length = 100
@@ -49,7 +48,6 @@ deps = coverage
 deps = coverage
 skip_install = true
 commands =
-    coverage combine
     coverage report
 
 [testenv:check]