Update dep for compose 3.5+ (#1120)

* Update vendor packages

* Support compose 3.5+ versions

vendor/github.com/docker/cli/opts/envfile.go

@@ -1,13 +1,7 @@
 package opts
 
 import (
-	"bufio"
-	"bytes"
-	"fmt"
 	"os"
-	"strings"
-	"unicode"
-	"unicode/utf8"
 )
 
 // ParseEnvFile reads a file with environment variables enumerated by lines
@@ -24,58 +18,5 @@ import (
 // environment variables, that's why we just strip leading whitespace and
 // nothing more.
 func ParseEnvFile(filename string) ([]string, error) {
-	fh, err := os.Open(filename)
-	if err != nil {
-		return []string{}, err
-	}
-	defer fh.Close()
-
-	lines := []string{}
-	scanner := bufio.NewScanner(fh)
-	currentLine := 0
-	utf8bom := []byte{0xEF, 0xBB, 0xBF}
-	for scanner.Scan() {
-		scannedBytes := scanner.Bytes()
-		if !utf8.Valid(scannedBytes) {
-			return []string{}, fmt.Errorf("env file %s contains invalid utf8 bytes at line %d: %v", filename, currentLine+1, scannedBytes)
-		}
-		// We trim UTF8 BOM
-		if currentLine == 0 {
-			scannedBytes = bytes.TrimPrefix(scannedBytes, utf8bom)
-		}
-		// trim the line from all leading whitespace first
-		line := strings.TrimLeftFunc(string(scannedBytes), unicode.IsSpace)
-		currentLine++
-		// line is not empty, and not starting with '#'
-		if len(line) > 0 && !strings.HasPrefix(line, "#") {
-			data := strings.SplitN(line, "=", 2)
-
-			// trim the front of a variable, but nothing else
-			variable := strings.TrimLeft(data[0], whiteSpaces)
-			if strings.ContainsAny(variable, whiteSpaces) {
-				return []string{}, ErrBadEnvVariable{fmt.Sprintf("variable '%s' has white spaces", variable)}
-			}
-
-			if len(data) > 1 {
-
-				// pass the value through, no trimming
-				lines = append(lines, fmt.Sprintf("%s=%s", variable, data[1]))
-			} else {
-				// if only a pass-through variable is given, clean it up.
-				lines = append(lines, fmt.Sprintf("%s=%s", strings.TrimSpace(line), os.Getenv(line)))
-			}
-		}
-	}
-	return lines, scanner.Err()
-}
-
-var whiteSpaces = " \t"
-
-// ErrBadEnvVariable typed error for bad environment variable
-type ErrBadEnvVariable struct {
-	msg string
-}
-
-func (e ErrBadEnvVariable) Error() string {
-	return fmt.Sprintf("poorly formatted environment: %s", e.msg)
+	return parseKeyValueFile(filename, os.Getenv)
 }