migrate to travis-ci.com

CHANGELOG

@@ -1,3 +1,5 @@
+0.4.6
+ - maintenance release
 0.4.5
  - setup: bump scipy to 1.4.0 (updated QHull in griddata)
 0.4.4

README.rst

@@ -33,7 +33,7 @@ Some functionalities of the module are tested with
 .. |PyPI Version| image:: https://img.shields.io/pypi/v/radontea.svg
    :target: https://pypi.python.org/pypi/radontea
 .. |Tests Status| image:: https://img.shields.io/travis/RI-imaging/radontea.svg?label=tests
-   :target: https://travis-ci.org/RI-imaging/radontea
+   :target: https://travis-ci.com/RI-imaging/radontea
 .. |Coverage Status| image:: https://img.shields.io/codecov/c/github/RI-imaging/radontea/master.svg
    :target: https://codecov.io/gh/RI-imaging/radontea
 .. |Docs Status| image:: https://readthedocs.org/projects/radontea/badge/?version=latest