limit batch record num while create catch up tasks

README.md

@@ -62,7 +62,4 @@ docker run --name rainbow-sync \&
   ```bash
      db.sync_iris_task.insert({'start_height':NumberLong(17908),'end_height':NumberLong(0),'current_height':NumberLong(0),'status':'unhandled','last_update_time':NumberLong(1576208532)})
   ```
-  Then,start the rainbow-sync.
-  - synchronizes  irishub data from  0 block height  
-  Please pay attention to setting the appropriate value about BLOCK_NUM_PER_WORKER_HANDLE for mongodb batch limit(Maximum batch size is 1000.) when blockchain height reachs tens of millions.
-
+  Then,start the rainbow-sync.

go.mod

@@ -1,19 +1,19 @@
 module github.com/irisnet/rainbow-sync
 
-        go 1.13
+go 1.13
 
-        require (
-        github.com/irisnet/irishub v0.16.0
-        github.com/jolestar/go-commons-pool v2.0.0+incompatible
-        github.com/tendermint/tendermint v0.32.8
-        go.uber.org/zap v1.13.0
-        gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22
-        gopkg.in/natefinch/lumberjack.v2 v2.0.0
-        gopkg.in/tomb.v2 v2.0.0-20161208151619-d5d1b5820637 // indirect
-        )
+require (
+	github.com/irisnet/irishub v0.16.0
+	github.com/jolestar/go-commons-pool v2.0.0+incompatible
+	github.com/tendermint/tendermint v0.32.8
+	go.uber.org/zap v1.13.0
+	gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22
+	gopkg.in/natefinch/lumberjack.v2 v2.0.0
+	gopkg.in/tomb.v2 v2.0.0-20161208151619-d5d1b5820637 // indirect
+)
 
-        replace (
-        github.com/tendermint/iavl => github.com/irisnet/iavl v0.12.3
-        github.com/tendermint/tendermint => github.com/irisnet/tendermint v0.32.1
-        golang.org/x/crypto => github.com/tendermint/crypto v0.0.0-20180820045704-3764759f34a5
-        )
+replace (
+	github.com/tendermint/iavl => github.com/irisnet/iavl v0.12.3
+	github.com/tendermint/tendermint => github.com/irisnet/tendermint v0.32.1
+	golang.org/x/crypto => github.com/tendermint/crypto v0.0.0-20180820045704-3764759f34a5
+)