chore: remove appveyor config

.appveyor.yml

@@ -1,66 +0,0 @@
-version: '{build}'
-image: 'Visual Studio 2017'
-platform: x64
-
-clone_folder: 'c:\go\src\github.com\appleboy\drone-telegram'
-max_jobs: 1
-
-environment:
-  GOPATH: c:\go
-  docker_username:
-    secure: em/TNLUXxG19O/HvbvfJuQ==
-  docker_password:
-    secure: Yo9FJJqihaNz5q8T4Jz8tQ==
-
-branches:
-  only:
-    - master
-
-install:
-  - echo %PATH%
-  - echo %GOPATH%
-  - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
-  - go version
-  - go env
-  - docker version
-
-build_script:
-  - ps: |
-      if ( $env:APPVEYOR_REPO_TAG -eq 'false' ) {
-        go build -ldflags "-X main.Version=$env:APPVEYOR_REPO_COMMIT -X main.BuildNum=$env:APPVEYOR_BUILD_VERSION" -a -o drone-telegram.exe
-      } else {
-        $version = $env:APPVEYOR_REPO_TAG_NAME
-        go build -ldflags "-X main.Version=$version -X main.BuildNum=$env:APPVEYOR_BUILD_VERSION" -a -o drone-telegram.exe
-      }
-      docker pull microsoft/nanoserver:10.0.14393.1884
-      docker build -f Dockerfile.windows -t appleboy/drone-telegram:windows-amd64 .
-
-test_script:
-  - ps: |
-      docker run --rm appleboy/drone-telegram:windows-amd64 --version
-
-deploy_script:
-  - ps: |
-      $ErrorActionPreference = 'Stop';
-      if ( $env:APPVEYOR_PULL_REQUEST_NUMBER ) {
-        Write-Host Nothing to deploy.
-      } else {
-        echo $env:DOCKER_PASSWORD | docker login --username $env:DOCKER_USERNAME --password-stdin
-        if ( $env:APPVEYOR_REPO_TAG -eq 'true' ) {
-          $major,$minor,$patch = $env:APPVEYOR_REPO_TAG_NAME.split('.')
-          docker push appleboy/drone-telegram:windows-amd64
-
-          docker tag appleboy/drone-telegram:windows-amd64 appleboy/drone-telegram:$major.$minor.$patch-windows-amd64
-          docker push appleboy/drone-telegram:$major.$minor.$patch-windows-amd64
-
-          docker tag appleboy/drone-telegram:windows-amd64 appleboy/drone-telegram:$major.$minor-windows-amd64
-          docker push appleboy/drone-telegram:$major.$minor-windows-amd64
-
-          docker tag appleboy/drone-telegram:windows-amd64 appleboy/drone-telegram:$major-windows-amd64
-          docker push appleboy/drone-telegram:$major-windows-amd64
-        } else {
-          if ( $env:APPVEYOR_REPO_BRANCH -eq 'master' ) {
-            docker push appleboy/drone-telegram:windows-amd64
-          }
-        }
-      }