Prepare changelog for upcoming release

[lbonn]

Looks like we don't have anything to get from the docs branch this time

[codecov-commenter]

Codecov Report

Merging #1682 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1682      +/-   ##
==========================================
- Coverage   82.74%   82.69%   -0.06%     
==========================================
  Files         190      190              
  Lines       12162    12162              
==========================================
- Hits        10064    10057       -7     
- Misses       2098     2105       +7     

Impacted Files	Coverage Δ
src/libaktualizr/storage/sqlstorage_base.h	60.00% <0.00%> (-40.00%)	⬇️
src/libaktualizr/storage/sqlstorage_base.cc	76.87% <0.00%> (-2.73%)	⬇️
src/libaktualizr/storage/sql_utils.h	83.11% <0.00%> (-2.60%)	⬇️
src/libaktualizr/storage/sqlstorage.cc	79.83% <0.00%> (-0.10%)	⬇️
src/aktualizr_info/main.cc	92.34% <0.00%> (+0.85%)	⬆️

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[pattivacek]

Thanks!