Add @minutely as pre-defined schedule

README.md

@@ -61,6 +61,7 @@ Predefined cron expressions
     @weekly     Run once a week at midnight in the morning of Sunday                    0 0 0 * * 0 *
     @daily      Run once a day at midnight                                              0 0 0 * * * *
     @hourly     Run once an hour at the beginning of the hour                           0 0 * * * * *
+    @minutely   Run once a minute at the beginning of the minute                        0 * * * * * *
     @reboot     Not supported
 
 Other details

cronexpr_parse.go

@@ -204,7 +204,9 @@ var cronNormalizer = strings.NewReplacer(
 	"@monthly", "0 0 0 1 * * *",
 	"@weekly", "0 0 0 * * 0 *",
 	"@daily", "0 0 0 * * * *",
-	"@hourly", "0 0 * * * * *")
+	"@hourly", "0 0 * * * * *",
+	"@minutely", "0 * * * * * *",
+)
 
 /******************************************************************************/
 

cronexpr_test.go

@@ -287,6 +287,7 @@ func TestNextN_every5min(t *testing.T) {
 /******************************************************************************/
 
 var benchmarkExpressions = []string{
+	"@minutely",
 	"* * * * *",
 	"@hourly",
 	"@weekly",