[gitignore] Remove nosetests.xml from gitignore

Because we don't use it (we are using pytest), so better keep it simple

Note: this was introduced by mistake in b5d9b61

Author: opacam

.gitignore

@@ -28,7 +28,6 @@ htmlcov/
 .coverage
 .coverage.*
 .cache
-nosetests.xml
 coverage.xml
 *.cover
 .pytest_cache/