Test more platforms

It would be 5 * 3 = 15 runs

.travis.yml

@@ -1,76 +1,21 @@
 language: go
 go_import_path: github.com/sirupsen/logrus
+git:
+  depth: 1
 env:
-  - GOMAXPROCS=4 GORACE=halt_on_error=1
+  - GO111MODULE=on
+  - GO111MODULE=off
+go: [ 1.10.x, 1.11.x, 1.12.x ]
+os: [ linux, osx, windows ]
 matrix:
-  include:
-    - go: 1.10.x
-      install:
-        - go get github.com/stretchr/testify/assert
-        - go get golang.org/x/sys/unix
-        - go get golang.org/x/sys/windows
-      script:
-        - go test -race -v ./...
-    - go: 1.11.x
-      env: GO111MODULE=on
-      install:
-        - go mod download
-      script:
-        - go test -race -v ./...
-    - go: 1.11.x
-      env: GO111MODULE=off
-      install:
-        - go get github.com/stretchr/testify/assert
-        - go get golang.org/x/sys/unix
-        - go get golang.org/x/sys/windows
-      script:
-        - go test -race -v ./...
-    - go: 1.12.x
-      env: GO111MODULE=on
-      install:
-        - go mod download
-      script:
-        - go test -race -v ./...
-    - go: 1.12.x
-      env: GO111MODULE=off
-      install:
-        - go get github.com/stretchr/testify/assert
-        - go get golang.org/x/sys/unix
-        - go get golang.org/x/sys/windows
-      script:
-        - go test -race -v ./...
-    - go: 1.10.x
-      install:
-        - go get github.com/stretchr/testify/assert
-        - go get golang.org/x/sys/unix
-        - go get golang.org/x/sys/windows
-      script:
-        - go test -race -v -tags appengine ./...
-    - go: 1.11.x
-      env: GO111MODULE=on
-      install:
-        - go mod download
-      script:
-        - go test -race -v -tags appengine ./...
-    - go: 1.11.x
-      env: GO111MODULE=off
-      install:
-        - go get github.com/stretchr/testify/assert
-        - go get golang.org/x/sys/unix
-        - go get golang.org/x/sys/windows
-      script:
-        - go test -race -v -tags appengine ./...
-    - go: 1.12.x
-      env: GO111MODULE=on
-      install:
-        - go mod download
-      script:
-        - go test -race -v -tags appengine ./...
-    - go: 1.12.x
-      env: GO111MODULE=off
-      install:
-        - go get github.com/stretchr/testify/assert
-        - go get golang.org/x/sys/unix
-        - go get golang.org/x/sys/windows
-      script:
-        - go test -race -v -tags appengine ./...
+  exclude:
+    - env: GO111MODULE=on
+      go: 1.10.x
+install:
+  - if [[ "$GO111MODULE" ==  "on" ]]; then go mod download; fi
+  - if [[ "$GO111MODULE" == "off" ]]; then go get github.com/stretchr/testify/assert golang.org/x/sys/unix github.com/konsorten/go-windows-terminal-sequences; fi
+script:
+  - export GOMAXPROCS=4
+  - export GORACE=halt_on_error=1
+  - go test -race -v ./...
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then go test -race -v -tags appengine ./... ; fi