Github user chlowell commented on the issue:
https://github.com/apache/log4net/pull/16
@bodewig I chose the version number to prevent any confusion between
prerelease and published packages. There's no reason not to change it before
release.
I chose `netstandard1.3` because it's the lowest version with the required
APIs. Targeting a higher version than necessary generally brings no benefit.
For example, UAP 10.0 (the current version) supports `netstandard1.4`. If
log4net targets `netstandard1.6`, UWP apps won't be able to use it (at least,
not without a hack). There's more on this in the
[docs](https://docs.microsoft.com/en-us/dotnet/articles/standard/library#net-platforms-support).
There's no need to worry about overriding--a project targeting .NET
Framework 4.5 or below won't use the `netstandard1.3` assembly.
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