Go 1.10 support (#223)

* Update Travis CI to use latest Go releases

* Fix go vet issues for Go 1.10

Starting in Go 1.10, the `go test` command now automatically runs `go
vet`. This commit fixes two issues flagged by vet that cause `go test`
to fail.

* Fix gofmt issue for Go 1.10

Go 1.10 introduced a small formatting change with comments in empty
multiline slice definitions.  This commit attempts to move the offending
comment in such a way that all version of gofmt will agree on its
location.

* Remove go-vet from test.sh

Starting in Go 1.10, the `go test` command automatically runs `go vet`,
so we don't need to run `go vet` explicitly from within test.sh.

Fixes #222

query/parser_test.go

@@ -2,12 +2,13 @@ package query
 
 import (
 	"fmt"
-	"github.com/pelletier/go-toml"
 	"io/ioutil"
 	"sort"
 	"strings"
 	"testing"
 	"time"
+
+	"github.com/pelletier/go-toml"
 )
 
 type queryTestNode struct {
@@ -406,8 +407,7 @@ func TestQueryFilterFn(t *testing.T) {
 
 	assertQueryPositions(t, string(buff),
 		"$..[?(float)]",
-		[]interface{}{
-		// no float values in document
+		[]interface{}{ // no float values in document
 		})
 
 	tv, _ := time.Parse(time.RFC3339, "1979-05-27T07:32:00Z")