require on redeemEnableTime in Auction4Reputation.redeem should be >0

In `Auction4Reputation.redeem` we see this line:

```
require(now > redeemEnableTime, "require now > redeemEnableTime")
```

I think this would be more reasonable, as well as consistent with other similar code if it were `>=`:

```
require(now > redeemEnableTime, "require now >= redeemEnableTime")
```
