Remove Travis CI related contents (#792)

.travis.yml

----
-language: go
-
-services:
-  - docker
-
-notifications:
-  email: false
-
-before_install:
-  - sudo apt-get -qq update
-  - sudo apt-get install -y rpm
-  - pip install --user yamllint==1.18.0
-  - gem install --no-document fpm
-  - go get -t -v ./...
-  - |
-    if [ "$TRAVIS_BRANCH" = "main" -a "$TRAVIS_PULL_REQUEST" = "false" ]; then
-      echo "$DOCKER_PASSWORD" | docker login --username "$DOCKER_USERNAME" --password-stdin
-    fi
-
-script:
-  - yamllint -c ./.yamllint.yaml .
-
-  # Run unit and integration tests
-  - make tests
-  - make integration-tests
-
-  # Build a local container image to test that the install sub-command works
-  - IMAGE_NAME=kube-bench make build-docker
-  - docker run -v `pwd`:/host kube-bench install
-  - test -d cfg
-  - test -f kube-bench
-  # Build and push the multi-arch Docker image
-  - |
-    if [ "$TRAVIS_BRANCH" = "main" -a "$TRAVIS_PULL_REQUEST" = "false" ]; then
-      make docker
-    fi
-
-after_success:
-  - bash <(curl -s https://codecov.io/bash)
-deploy:
-  - provider: script
-    skip_cleanup: true
-    script: curl -sL https://git.io/goreleaser | bash
-    on:
-      tags: true
-      condition: "$TRAVIS_OS_NAME = linux"
-
-env:
-  global:
-    secure: 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
-  matrix:
-    - GO111MODULE=on

README.md

@@ -2,7 +2,7 @@
 ![Downloads][download]
 ![Docker Pulls][docker-pull]
 [![Go Report Card][report-card-img]][report-card]
-[![Build Status](https://travis-ci.org/aquasecurity/kube-bench.svg?branch=main)](https://travis-ci.org/aquasecurity/kube-bench)
+[![Build Status](https://github.com/aquasecurity/kube-bench/workflows/Build/badge.svg?branch=main)](https://github.com/aquasecurity/kube-bench/actions)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/aquasecurity/kube-bench/blob/main/LICENSE)
 [![Docker image](https://images.microbadger.com/badges/image/aquasec/kube-bench.svg)](https://microbadger.com/images/aquasec/kube-bench "Get your own image badge on microbadger.com")
 [![Source commit](https://images.microbadger.com/badges/commit/aquasec/kube-bench.svg)](https://microbadger.com/images/aquasec/kube-bench)