Update CHANGELOG for v2.2007.4 (dgraph-io#1740)

(cherry picked from commit ee6065b)

chore: update changelog for v2.2007.3 (dgraph-io#1733)

(cherry picked from commit 6c1e5bc)

chore: update changelog for v3.2103.1 (dgraph-io#1727)

(cherry picked from commit 4944ea7)

chore: update changelog for v3.2103 (dgraph-io#1711)

fix(compaction): Set base level correctly after stream (dgraph-io#1631)…

… (dgraph-io#1651)

When we use stream writer, all the data is written to the last level. On the restart,
badger will try to figure out the correct base level. This computation of base level
is incorrect right now because of which we pick the baseLevel which has levels
below it that are empty.

(cherry picked from commit d1125c4)

Co-authored-by: Ibrahim Jarif <[email protected]>

chore(badger): adding changelog (dgraph-io#1641)

* adding changelog

* adding message line about non compatibility

Add changelog for v1.6.2 (dgraph-io#1517)

Fix changelog for v2.2007.2 (dgraph-io#1490) (dgraph-io#1491)

Add information about two new commits.

(cherry picked from commit 84cc0bf)

Fix changelog for v2.2007.1

Fix changelog for v2.2007.0