Add tilde at front of userdata 'create_time'

[Linary]

Change-Id: I9b943c4c25f9189cbf42ea50f9e66aafb66c4a27

[javeme]

prefer use tilde

[codecov]

Codecov Report

Merging #909 into master will increase coverage by 0.53%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #909      +/-   ##
============================================
+ Coverage     71.74%   72.27%   +0.53%     
- Complexity     4455     4500      +45     
============================================
  Files           287      287              
  Lines         21430    21430              
  Branches       3022     3022              
============================================
+ Hits          15374    15489     +115     
+ Misses         4546     4431     -115     
  Partials       1510     1510              

Impacted Files	Coverage Δ	Complexity Δ
...main/java/com/baidu/hugegraph/schema/Userdata.java	50.00% <ø> (ø)	4.00 <0.00> (ø)
...hugegraph/backend/serializer/BinarySerializer.java	83.39% <0.00%> (+0.17%)	104.00% <0.00%> (+1.00%)
...du/hugegraph/backend/tx/GraphIndexTransaction.java	79.97% <0.00%> (+0.24%)	186.00% <0.00%> (+1.00%)
...c/main/java/com/baidu/hugegraph/task/HugeTask.java	72.09% <0.00%> (+0.77%)	66.00% <0.00%> (+1.00%)
...a/com/baidu/hugegraph/backend/query/Condition.java	79.66% <0.00%> (+0.82%)	31.00% <0.00%> (ø%)
.../hugegraph/backend/store/rocksdb/RocksDBStore.java	70.60% <0.00%> (+2.87%)	56.00% <0.00%> (+3.00%)
...raph/backend/store/rocksdb/RocksDBStdSessions.java	69.97% <0.00%> (+3.54%)	29.00% <0.00%> (+1.00%)
...hugegraph/backend/store/rocksdb/RocksDBTables.java	67.52% <0.00%> (+6.83%)	0.00% <0.00%> (ø%)
...om/baidu/hugegraph/backend/store/BackendEntry.java	73.33% <0.00%> (+33.33%)	1.00% <0.00%> (ø%)
.../hugegraph/backend/store/rocksdb/RocksDBTable.java	76.59% <0.00%> (+55.31%)	33.00% <0.00%> (+24.00%)
... and 1 more

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