8.13.0

Docs fixes #342 #358, #362, thanks @PhilT @ZaymonFC @dmitrydprog
Fix TestBuilder bug #341, thanks @haf
Upgrade Paket, DotNetBenchmark #355, thanks @haf
Refactor files; split into separate files #353, thanks @haf
Get inner message exceptions, #349 thanks @MNie
Update Logary sample, #347 thanks @smoothdeveloper
LARGE IMPROVEMENT: use DiffPlex for diffs (opt-in right now) #346, thanks @drhumlen
Configure WhiteSource for security scanning Expecto, #344 thanks @haf
Report duplicate test names in printer, #339, thanks @auduchinok
Improve Travis build for .Net Core #338 thanks @auduchinok
(Missed creds to @TheAngryByrd in 8.12 for improving TestJobBuilder)
Thank you everyone❣️