chore: upgrade tox ini

tox.ini

@@ -1,14 +1,15 @@
 [tox]
-envlist = flake8, docs, py{27,35,36}
+envlist = flake8, docs, py3{5,6,7,8}
 
 [travis]
 os =
-    linux: flake8, py{27,35,36}
-    osx: py{27,35}
+    linux: flake8, py3{5,6,7,8}
+    osx: py35
 python =
-    2.7: py27, flake8
-    3.5: py35, flake8
-    3.6: py36
+    3.5: py35
+    3.6: py36, flake8
+    3.7: py37
+    3.8: py38
 
 [testenv]
 deps =
@@ -38,11 +39,30 @@ commands=
     make -C {toxinidir}/docs linkcheck
     make docs
 
+################################################################################
+# Testing tools configuration                                                  #
+################################################################################
+
 [pytest]
-markers =
-    raises
 testpaths =
     tests
+markers =
+    raises
+
+[coverage:paths]
+source =
+    src/memote
+    */site-packages/memote
+
+[coverage:run]
+branch = true
+parallel = true
+
+[coverage:report]
+exclude_lines =
+    # Have to re-enable the standard pragma
+    pragma: no cover
+precision = 2
 
 [flake8]
 max-line-length = 80