Publishing symbols

[rasmus]

AppVeyor doesn't pick up .snupkg files according to appveyor/ci#2753.

Documentation here: https://docs.microsoft.com/en-us/nuget/create-packages/symbol-packages-snupkg

EventFlow correctly builds the packages after #638

[codecov]

Codecov Report

Merging #639 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #639   +/-   ##
========================================
  Coverage    72.26%   72.26%           
========================================
  Files          317      317           
  Lines         7910     7910           
  Branches      2222     2319   +97     
========================================
  Hits          5716     5716           
- Misses        1428     1429    +1     
+ Partials       766      765    -1

Impacted Files	Coverage Δ
...Flow.MongoDB/EventStore/MongoDbEventPersistence.cs	66.66% <0%> (-5.56%)	⬇️
...EventFlow/Configuration/Bootstraps/Bootstrapper.cs	92.59% <0%> (-3.71%)	⬇️
...w.MsSql/RetryStrategies/MsSqlErrorRetryStrategy.cs	48.27% <0%> (-3.45%)	⬇️
...Core/VersionedTypes/VersionedTypeUpgradeService.cs	78.37% <0%> (-2.71%)	⬇️
...EventFlow/ReadStores/InMemory/InMemoryReadStore.cs	69.56% <0%> (-2.18%)	⬇️
...ce/EventFlow/Sagas/AggregateSagas/AggregateSaga.cs	91.3% <0%> (-2.18%)	⬇️
...entFlow/EventStores/Files/FilesEventPersistence.cs	70.58% <0%> (-1.48%)	⬇️
Source/EventFlow/Sagas/DispatchToSagas.cs	87.67% <0%> (-1.37%)	⬇️
...tgreSql/EventStores/PostgresSqlEventPersistence.cs	62.36% <0%> (+6.45%)	⬆️
...ngoDB/SnapshotStores/MongoDbSnapshotPersistence.cs	96.07% <0%> (+9.8%)	⬆️

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[rasmus]

Publish docs: https://www.appveyor.com/docs/deployment/nuget/

[rasmus]

snupkg seems empty

[rasmus]

Although the source link integration is broken, we should still publish the snupkg packages #644