Fix and enable goimports linter (#591)

.travis.yml

@@ -30,7 +30,7 @@ before_script:
   - PKGS=$(go list ./... | grep -v /vendor/)             # All the import paths, excluding vendor/
 #  - go get github.com/golang/lint/golint                 # Linter
 #- go get honnef.co/go/tools/cmd/megacheck              # Badass static analyzer/linter
-  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin v1.12
+  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin v1.12.2
 
 
 # Anything in before_script: that returns a nonzero exit code will
@@ -40,7 +40,7 @@ script:
   #- test -z "$(go fmt ./...)"         # Fail if a .go file hasn't been formatted with gofmt
   - go test -v -race $PKGS            # Run all the tests with the race detector enabled
   #- go vet $PKGS                      # go vet is the official Go static analyzer
-  - golangci-lint run --enable-all -D golint -D lll -D errcheck -D goimports -D gosec -D maligned -D prealloc -D gocyclo -D gochecknoglobals
+  - golangci-lint run --enable-all -D golint -D lll -D errcheck -D gosec -D maligned -D prealloc -D gocyclo -D gochecknoglobals
   #- megacheck $PKGS                   # "go vet on steroids" + linter
   - /bin/bash ci/bintray.sh
   #- golint -set_exit_status $PKGS     # one last linter

bridge/steam/steam.go

@@ -2,6 +2,9 @@ package bsteam
 
 import (
 	"fmt"
+	"strconv"
+	"sync"
+	"time"
 
 	"github.com/42wim/matterbridge/bridge"
 	"github.com/42wim/matterbridge/bridge/config"
@@ -9,10 +12,6 @@ import (
 	"github.com/Philipp15b/go-steam"
 	"github.com/Philipp15b/go-steam/protocol/steamlang"
 	"github.com/Philipp15b/go-steam/steamid"
-	//"io/ioutil"
-	"strconv"
-	"sync"
-	"time"
 )
 
 type Bsteam struct {

matterclient/matterclient.go

@@ -13,13 +13,12 @@ import (
 	"sync"
 	"time"
 
-	prefixed "github.com/matterbridge/logrus-prefixed-formatter"
-	log "github.com/sirupsen/logrus"
-
 	"github.com/gorilla/websocket"
 	"github.com/hashicorp/golang-lru"
 	"github.com/jpillora/backoff"
+	prefixed "github.com/matterbridge/logrus-prefixed-formatter"
 	"github.com/mattermost/platform/model"
+	log "github.com/sirupsen/logrus"
 )
 
 type Credentials struct {