fix --timezone default value (#31)

--timezone was using as a default value "utc" however the expected value
for LoadLocation was in uppercase.

See: https://github.com/golang/go/blob/f09db2bb9331f4b31afb867173b1773e6494af27/src/time/zoneinfo.go#L667

commands/new.go

@@ -61,7 +61,7 @@ func NewScriptCmd() *cobra.Command {
 	cmd.Flags().StringP("driver", "d", "", "the driver to use.")
 	cmd.Flags().BoolP("timestamp", "t", false, "a timestamp prefix will be added to migration file if set.")
 	cmd.Flags().StringP("timeformat", "f", "unix", "timestamp format to be used for timestamps.")
-	cmd.Flags().StringP("timezone", "z", "utc", "time zone to be used for timestamps.")
+	cmd.Flags().StringP("timezone", "z", "UTC", "time zone to be used for timestamps.")
 	cmd.Flags().BoolP("sequence", "s", false, "a sequence number prefix will be added to migration file if set.")
 	_ = cmd.MarkFlagRequired("driver")
 
@@ -78,7 +78,7 @@ func NewGenerateCmd() *cobra.Command {
 	cmd.Flags().StringP("driver", "d", "", "the driver to use.")
 	cmd.Flags().BoolP("timestamp", "t", false, "a timestamp prefix will be added to migration file if set.")
 	cmd.Flags().StringP("timeformat", "f", "unix", "timestamp format to be used for timestamps.")
-	cmd.Flags().StringP("timezone", "z", "utc", "time zone to be used for timestamps.")
+	cmd.Flags().StringP("timezone", "z", "UTC", "time zone to be used for timestamps.")
 	cmd.Flags().BoolP("sequence", "s", false, "a sequence number prefix will be added to migration file if set.")
 	_ = cmd.MarkFlagRequired("driver")