Use goreleaser to build and release (#244)

Instead of using gox on one side and an action to release, we can merge
them together with goreleaser which will build for extra targets (arm,
mips if needed in the future) and it also takes care of creating
checksums, a source archive, and a changelog and creating a release with
all the artifacts.

All binaries should respect the old naming convention, so any scripts
out there should still work.

Signed-off-by: Itxaka <igarcia@suse.com>

vendor/github.com/huandu/xstrings/manipulate.go

@@ -4,7 +4,6 @@
 package xstrings
 
 import (
-	"bytes"
 	"strings"
 	"unicode/utf8"
 )
@@ -131,7 +130,7 @@ func Insert(dst, src string, index int) string {
 // Scrub scrubs invalid utf8 bytes with repl string.
 // Adjacent invalid bytes are replaced only once.
 func Scrub(str, repl string) string {
-	var buf *bytes.Buffer
+	var buf *stringBuilder
 	var r rune
 	var size, pos int
 	var hasError bool
@@ -144,7 +143,7 @@ func Scrub(str, repl string) string {
 		if r == utf8.RuneError {
 			if !hasError {
 				if buf == nil {
-					buf = &bytes.Buffer{}
+					buf = &stringBuilder{}
 				}
 
 				buf.WriteString(origin[:pos])