Remove TravisCI config

I will use other CIs since TravisCI changed their business model.

.travis.yml

@@ -1,25 +0,0 @@
-dist: bionic
-language: python
-python:
-  - "3.6"
-  - "3.7"
-  - "3.8"
-  - "3.9"
-  - "nightly"
-jobs:
-  allow_failures:
-    - python: "nightly"
-addons:
-  postgresql: "10"
-before_script:
-  - psql --version
-  - createuser -U postgres dspacestatistics
-  - psql -U postgres -c "ALTER USER dspacestatistics WITH PASSWORD 'dspacestatistics'"
-  - createdb -U postgres -O dspacestatistics --encoding=UNICODE dspacestatistics
-  - psql -U postgres -d dspacestatistics < tests/dspacestatistics.sql
-install:
-  - "pip install -r requirements.txt"
-  - "pip install -r requirements-dev.txt"
-script: pytest
-
-# vim: ts=2 sw=2 et

README.md

@@ -1,4 +1,4 @@
-# DSpace Statistics API [![Build Status](https://travis-ci.com/ilri/dspace-statistics-api.svg?branch=master)](https://travis-ci.com/ilri/dspace-statistics-api) [![builds.sr.ht status](https://builds.sr.ht/~alanorth/dspace-statistics-api.svg)](https://builds.sr.ht/~alanorth/dspace-statistics-api?)
+# DSpace Statistics API [![Build Status](https://ci.mjanja.ch/api/badges/alanorth/dspace-statistics-api/status.svg?ref=refs/heads/v6_x)](https://ci.mjanja.ch/alanorth/dspace-statistics-api) [![builds.sr.ht status](https://builds.sr.ht/~alanorth/dspace-statistics-api.svg)](https://builds.sr.ht/~alanorth/dspace-statistics-api?)
 DSpace stores item view and download events in a Solr "statistics" core. This information is available for use in the various DSpace user interfaces, but is not exposed externally via any APIs. The DSpace 4/5/6 [REST API](https://wiki.lyrasis.org/display/DSDOC5x/REST+API), for example, only exposes information about communities, collections, item metadata, and bitstreams.
 
 - If your DSpace is version 4 or 5, use [dspace-statistics-api v1.1.1](https://github.com/ilri/dspace-statistics-api/releases/tag/v1.1.1)