Add Travis CI

.travis.yml

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+language: generic
+
+services:
+  - docker
+
+env:
+  - FEDORA=29
+  - FEDORA=30
+  - FEDORA=rawhide
+
+install:
+  - sed -i "s|FROM fedora|FROM registry.fedoraproject.org/fedora:${FEDORA}|" Dockerfile
+  - docker build -t tox-current-env .
+
+script:
+  - docker run -v $(pwd):$(pwd) -w $(pwd) -i -t tox-current-env

Dockerfile

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+FROM fedora
+
+RUN dnf -y install --setopt=install_weak_deps=false --setopt=tsflags=nodocs \
+    --setopt=deltarpm=false --allowerasing --best --disablerepo=\*modular \
+    tox python36 python37 python38 && \
+    dnf -y --setopt=install_weak_deps=false --setopt=tsflags=nodocs --best\
+    --setopt=deltarpm=false --allowerasing --disablerepo=\*modular update && \
+    dnf clean all
+
+ENV LANG=C.UTF-8 LC_ALL=C.UTF-8
+
+CMD ["/usr/bin/tox"]