The old EventWriter's Run does:
```go
for {
handlePause()
select {
case event <- Queue:
write the log event ...
}
}
```
So, if an event writer is started before the logger is paused, there is
a chance that the logger isn't paused for the first message.
The new logic is:
```go
for {
select {
case event <- Queue:
handlePause()
write the log event ...
}
}
```
Then the event writer can be correctly paused
wxiaoguang
0d54395fb5