ci, reuseport, writer: update travis config and goimports -w on whole…

… project

Signed-off-by: Kirill Danshin <kirill@danshin.pro>

.travis.yml

@@ -1,10 +1,26 @@
 language: go
 
 go:
+  - tip
+  - 1.10.x
   - 1.9.x
-  - 1.8.x
+
+os:
+  - linux
+  - osx
+
+matrix:
+  allow_failures:
+    - tip
+  fast_finish: true
+
+before_install:
+  - GO_FILES=$(find . -iname '*.go' -type f | grep -v /vendor/)
+  - go get -t -v ./...
+  - go get -v golang.org/x/tools/cmd/goimports
 
 script:
+  - test -z $(goimports -l $GO_FILES)
   # build test for supported platforms
   - GOOS=linux go build
   - GOOS=darwin go build

reuseport/reuseport.go

@@ -10,9 +10,10 @@ package reuseport
 
 import (
 	"fmt"
-	"github.com/valyala/tcplisten"
 	"net"
 	"strings"
+
+	"github.com/valyala/tcplisten"
 )
 
 // ErrNoReusePort is returned if the OS doesn't support SO_REUSEPORT.

stackless/writer.go

@@ -3,8 +3,9 @@ package stackless
 import (
 	"errors"
 	"fmt"
-	"github.com/valyala/bytebufferpool"
 	"io"
+
+	"github.com/valyala/bytebufferpool"
 )
 
 // Writer is an interface stackless writer must conform to.