Merge pull request #73 from sobolevn/patch-1

TravisCI is not used anymore

.travis.yml

@@ -1,19 +0,0 @@
-language: python
-matrix:
-  include:
-    - python: "2.7"
-      arch: ppc64le
-    - python: "3.6"
-      arch: ppc64le
-    - python: "3.7"
-      arch: ppc64le
-    - python: "3.8"
-      arch: ppc64le
-    - python: "3.9"
-      arch: ppc64le
-install:
-  - python -m pip install tox
-before_script:
-  - export TOXENV=$(echo py$TRAVIS_PYTHON_VERSION | tr -d .)
-script:
-  - python -m tox