fix: don't warn on duplicate numbers

Author: twpayne

dupword.go

@@ -289,6 +289,9 @@ func (a *analyzer) Check(raw string) (update string, keyword string, find bool)
 //	e.g. %s, </div> should not be reported.
 func ExcludeWords(word string) (exclude bool) {
 	firstRune, _ := utf8.DecodeRuneInString(word)
+	if unicode.IsDigit(firstRune) {
+		return true
+	}
 	if unicode.IsPunct(firstRune) {
 		return true
 	}

dupword_test.go

@@ -194,7 +194,12 @@ func TestExcludeWords(t *testing.T) {
 		{
 			name:        "number should not exclude",
 			args:        args{word: "3"},
-			wantExclude: false,
+			wantExclude: true,
+		},
+		{
+			name:        "number,number should exclude",
+			args:        args{word: "3,3 3,3"},
+			wantExclude: true,
 		},
 		{
 			name:        "%s should exclude",