Update changelogs for 2021.04.07 release
-v2021.03.22
+v2021.04.07
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-* Bug fixes and internal cleanup.
+* IntelliJ: Compatible with IntelliJ CE/UE 2020.3.
+* 2020.3+ versions: Integrate Bazel-based IntelliJ projects into the new
+ IntelliJ Welcome screen.
+* Fix displaying/modifying code style settings for BUILD files.
v2021.02.02
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