Merge pull request #139 from apache/update_ds-java-4.0.0release

Update ds-java-4.0.0 release in Downloads Table.
diff --git a/docs/img/CPC_HLL_Theta_union_update_time.png b/docs/img/CPC_HLL_Theta_union_update_time.png
index 89f0aee..06d78fd 100644
--- a/docs/img/CPC_HLL_Theta_union_update_time.png
+++ b/docs/img/CPC_HLL_Theta_union_update_time.png
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