Remove travis config file; use GHA instead

.travis.yml

@@ -1,32 +0,0 @@
-language: c
-
-branches:
-  only:
-  - master
-
-matrix:
-  include:
-  # Python 3.5 with ghdl llvm
-  - env: BUILD_NAME=ACCEPTANCE
-    os: linux
-    sudo: required
-    dist: trusty
-    before_install:
-    - sudo apt-get update -qq
-    - sudo apt-get install -y gnat-4.8 zlib1g-dev
-    - sudo apt-get install -y llvm-3.5-dev llvm-3.5-tools libedit-dev
-    before_script:
-    - cd ..
-    - git clone --depth 1 https://github.com/tgingold/ghdl.git ghdl
-    - cd ghdl
-    - mkdir build-llvm
-    - cd build-llvm
-    - ../configure --with-llvm-config=llvm-config-3.5
-    - make
-    - sudo make install
-    - cd ../..
-
-install: true
-
-script:
-    - cd libvhdl/test; make all

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/tmeissner/libvhdl.svg?branch=master)](https://travis-ci.org/tmeissner/libvhdl)
+[![test](https://github.com/tmeissner/libvhdl/workflows/test/badge.svg?branch=master)](https://github.com/tmeissner/libvhdl/actions?query=workflow%3Atest)
 
 The original repository is now located on my own git-server at [https://git.goodcleanfun.de/tmeissner/libvhdl](https://git.goodcleanfun.de/tmeissner/libvhdl)
 It is mirrored to github with every push, so both should be in sync.