Include 0.59.1 in release notes

[gmaretic]

Goals (and why):
Consistent release notes

Priority (whenever / two weeks / yesterday):
When you get the chance

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This change is 

[codecov-io]

Codecov Report

Merging #2425 into develop will increase coverage by 0.04%.
The diff coverage is 58.33%.

@@              Coverage Diff              @@
##             develop    #2425      +/-   ##
=============================================
+ Coverage      60.28%   60.33%   +0.04%     
+ Complexity      4035     4033       -2     
=============================================
  Files            829      826       -3     
  Lines          39125    39074      -51     
  Branches        4019     4014       -5     
=============================================
- Hits           23587    23575      -12     
+ Misses         14067    14031      -36     
+ Partials        1471     1468       -3

Impacted Files	Coverage Δ	Complexity Δ
...lantir/atlasdb/http/AtlasDbFeignTargetFactory.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../java/com/palantir/atlasdb/http/TimelockUtils.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../com/palantir/atlasdb/http/FeignOkHttpClients.java	61.53% <50%> (ø)	0 <0> (ø)	⬇️
.../com/palantir/atlasdb/http/AtlasDbHttpClients.java	65.21% <60%> (ø)	4 <0> (ø)	⬇️
...a/com/palantir/atlasdb/factory/ServiceCreator.java	85.71% <76.92%> (ø)	1 <0> (ø)	⬇️
...ntir/atlasdb/keyvalue/jdbc/JdbcAtlasDbFactory.java	0% <0%> (-22.23%)	0% <0%> (-2%)
...tlasdb/keyvalue/dbkvs/DbKeyValueServiceConfig.java	85.71% <0%> (-14.29%)	4% <0%> (-1%)
...antir/atlasdb/keyvalue/dbkvs/DbAtlasDbFactory.java	0% <0%> (-13.34%)	0% <0%> (-2%)
... and 27 more

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[fsamuel-bs]

LGTM