Increment version

Merge remote-tracking branch 'origin/master'

# Conflicts:
#	isdayoff/Core/IsDayOffService.cs
#	isdayoff/IsDayOff.cs
#	isdayoff/isdayoff.csproj

Increment assembly and nuget package version to 1.5

Increment major version

Litva -> Latvia

Increment version and add release notes

* Update release notes

Preparing for v1.3.1

Update build-and-publish.yml

Update readme.md