ci: remove broken travis coverage job

.travis.yml

@@ -78,53 +78,3 @@ jobs:
               ghr -t $GITHUB_TOKEN -u $owner -r $repo -b "$body"--replace $TRAVIS_TAG postgrest-$TRAVIS_TAG-osx.tar.xz
             fi
           fi
-
-    - name: Code Coverage
-      os: linux
-      dist: focal
-      addons:
-        apt:
-          update: true
-          packages:
-            - postgresql-12
-            - python3
-            - python3-pip
-      cache:
-        yarn: true
-        timeout: 1000
-        directories:
-          - $HOME/.local/bin
-          - $HOME/.stack
-          - .stack-work
-      before_install: |
-        export PATH="$PATH:$HOME/.local/bin:/usr/lib/postgresql/12/bin"
-      install: |
-        if [[ ! -f "$HOME/.local/bin/stack" ]]
-        then
-          travis_retry curl -L https://get.haskellstack.org/stable/linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
-        fi
-        if [[ ! -f "$HOME/.local/bin/shc" ]]
-        then
-          travis_retry curl -L https://github.com/rubik/stack-hpc-coveralls/releases/download/v0.0.4.0/shc-linux-x64-8.0.1.tar.bz2 | tar -xj -C ~/.local/bin
-        fi
-        travis_wait stack --no-terminal setup
-        travis_wait stack --no-terminal install hpc
-        pip3 install pytest pyyaml requests requests-unixsocket pyjwt 
-      script: |
-        travis_wait 50 stack --no-terminal build --fast -j1 --coverage
-        travis_wait 50 stack --no-terminal build --fast -j1 --coverage --test --no-run-tests
-        test/with_tmp_db stack --no-terminal test --coverage
-        test/with_tmp_db stack --no-terminal exec -- pytest -v test/io-tests
-      after_script: |
-        export _HPC_DIR=$(stack path --local-hpc-root)
-        export _MIX_DIR=$(stack path --dist-dir)
-        export _PKG_NAME=$(stack exec -- ghc-pkg field postgrest key --simple-output)
-        # merge the results from `stack test` and the io tests and exclude Paths_postgrest
-        stack --no-terminal exec hpc -- sum --union --exclude=Paths_postgrest --output=/tmp/all.tix $_HPC_DIR/combined/all/all.tix postgrest.tix
-        # fix a bug in stack-hpc-coveralls
-        mv $_MIX_DIR/hpc/Main.mix $_MIX_DIR/hpc/$_PKG_NAME/Main.mix
-        mv $_MIX_DIR/hpc/UnixSocket.mix $_MIX_DIR/hpc/$_PKG_NAME/UnixSocket.mix
-        sed -i -r "s/(Main|UnixSocket)/$_PKG_NAME\/\1/g" /tmp/all.tix
-        # upload to coveralls
-        mv /tmp/all.tix $_HPC_DIR/combined/all/all.tix
-        shc combined all