Merge pull request NLog#2571 from NLog/release-4.5-rc5

4.5 rc5 version and release notes

4.5 RC 4

Merge pull request NLog#2460 from NLog/v45-rc3

NLog 4.5 rc3 version and changelog

Merge pull request NLog#2444 from NLog/rc2

NLog 4.5 RC2 version and changelog

Update build.ps1

Update build.ps1

Update build.ps1

Update build.ps1

Merge pull request NLog#2318 from NLog/304NotModified-patch-1

NLog 4.5 beta 4

Update build.ps1