feat: parse all begin/end date formats (#50)

Other date formats were already allowed for entries in the ledger data file,
and it was odd to hit time parse errors for dates written in these other
formats with the -b/--begin-date and -e/--end-date flags.

ledger/cmd/print.go

@@ -15,6 +15,7 @@ import (
 
 	"github.com/howeyc/ledger"
 	"github.com/howeyc/ledger/decimal"
+	date "github.com/joyt/godate"
 	"github.com/spf13/cobra"
 )
 
@@ -34,8 +35,8 @@ func cliTransactions() ([]*ledger.Transaction, error) {
 		columnWidth = 132
 	}
 
-	parsedStartDate, tstartErr := time.Parse(transactionDateFormat, startString)
-	parsedEndDate, tendErr := time.Parse(transactionDateFormat, endString)
+	parsedStartDate, tstartErr := date.Parse(startString)
+	parsedEndDate, tendErr := date.Parse(endString)
 
 	if tstartErr != nil || tendErr != nil {
 		return nil, errors.New("unable to parse start or end date string argument")