diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5f5f083..6a261a0 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -21,7 +21,7 @@ jobs:
           name: run test
           command: |
             go get -v -t -d ./...
-            GO111MODULE=off go get github.com/mattn/goveralls
+            go get github.com/mattn/goveralls
             go test -v -cover -coverprofile=coverage.out
             $GOPATH/bin/goveralls -coverprofile=coverage.out -service=circle-ci -repotoken=$COVERALLS_TOKEN
 
@@ -32,6 +32,6 @@ workflows:
 #      - build
       - test
 
-#notify:
-#  webhooks:
-#    - url: https://coveralls.io/webhook?repo_token=${process.env.COVERALLS_REPO_TOKEN}
+notify:
+ webhooks:
+   - url: https://coveralls.io/webhook?repo_token=${process.env.COVERALLS_REPO_TOKEN}
diff --git a/.travis.yml b/.travis.yml
index f19635c..a7c43db 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,27 +1,27 @@
 ---
-language: go
-go:
-  - 1.9
-  - 1.10
-  - 1.11
-  - 1.12
-  - 1.13
-  - 1.14
-  - 1.15
-  - tip
+# language: go
+# go:
+#   - 1.9
+#   - 1.10
+#   - 1.11
+#   - 1.12
+#   - 1.13
+#   - 1.14
+#   - 1.15
+#   - tip
 
-before_install:
-  - go get github.com/mattn/goveralls
-  - go get github.com/axw/gocov/gocov
-  - go get github.com/mattn/goveralls
-  - go get golang.org/x/crypto/nacl/secretbox
-  - go get golang.org/x/tools/cmd/cover
-  - go get -v -t -d ./...
+# before_install:
+#   - go get github.com/mattn/goveralls
+#   - go get github.com/axw/gocov/gocov
+#   - go get github.com/mattn/goveralls
+#   - go get golang.org/x/crypto/nacl/secretbox
+#   - go get golang.org/x/tools/cmd/cover
+#   - go get -v -t -d ./...
 
-install:
-  #- $HOME/gopath/bin/goveralls -service=travis-ci -repotoken=$COVERALLS_TOKEN
-  - goveralls -service=travis-ci -repotoken=$COVERALLS_TOKEN
+# install:
+#   #- $HOME/gopath/bin/goveralls -service=travis-ci -repotoken=$COVERALLS_TOKEN
+#   - goveralls -service=travis-ci -repotoken=$COVERALLS_TOKEN
 
-script:
-  - go test -v ./...
-  - go test -bench -v ./...
+# script:
+#   - go test -v ./...
+#   - go test -bench -v ./...
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
new file mode 100644
index 0000000..060ae62
--- /dev/null
+++ b/azure-pipelines.yml
@@ -0,0 +1,95 @@
+trigger:
+- master
+
+stages:
+- stage: run_checks
+  displayName: "Check"
+  dependsOn: []
+  jobs:
+  - job: fmt
+    displayName: "fmt"
+    pool:
+      vmImage: ubuntu-latest
+    steps:
+    - task: GoTool@0
+      displayName: "Install Go 1.16"
+      inputs:
+        version: "1.16"
+    - task: Go@0
+      displayName: "go fmt ./..."
+      inputs:
+        command: 'custom'
+        customCommand: 'fmt'
+        arguments: './...'
+  - job: coverage
+    dependsOn: fmt
+    displayName: "coverage"
+    pool:
+      vmImage: ubuntu-latest
+    steps:
+    - task: GoTool@0
+      displayName: "Install Go 1.16"
+      inputs:
+        version: "1.16"
+    - task: Go@0
+      displayName: "Generate coverage"
+      inputs:
+        command: 'test'
+        arguments: "-race -coverprofile=coverage.txt -covermode=atomic"
+    - task: Bash@3
+      inputs:
+        targetType: 'inline'
+        script: 'bash <(curl -s https://codecov.io/bash) -t ${CODECOV_TOKEN}'
+      env:
+        CODECOV_TOKEN: $(CODECOV_TOKEN)
+  - job: go_unit_tests
+    dependsOn: coverage
+    displayName: "unit tests"
+    strategy:
+      maxParallel: 1
+      matrix:
+        linux_amd64 1.16:
+          goVersion: '1.16'
+          imageName: 'ubuntu-latest'
+          GOOS: linux
+          GOARCH: amd64
+        mac_amd64 1.16:
+          goVersion: '1.16'
+          imageName: 'macOS-latest'
+          GOOS: darwin
+          GOARCH: amd64
+        windows_amd64 1.16:
+          goVersion: '1.16'
+          imageName: 'windows-latest'
+          GOOS: windows
+          GOARCH: amd64
+        linux_amd64 1.9:
+          goVersion: '1.9'
+          imageName: 'ubuntu-latest'
+          GOOS: linux
+          GOARCH: amd64
+        mac_amd64 1.9:
+          goVersion: '1.9'
+          imageName: 'macOS-latest'
+          GOOS: darwin
+          GOARCH: amd64
+        windows_amd64 1.9:
+          goVersion: '1.9'
+          imageName: 'windows-latest'
+          GOOS: windows
+          GOARCH: amd64
+    pool:
+      vmImage: $(imageName)
+    steps:
+    - task: GoTool@0
+      displayName: "Install Go $(goVersion)"
+      inputs:
+        version: $(goVersion)
+    - task: Go@0
+      displayName: "go test ./..."
+      inputs:
+        command: 'test'
+        arguments: './...'
+      env:
+        go.goos: $(GOOS)
+        go.goarch: $(GOARCH)