* prevent unnecessarybuilds

* readd qt5 string

sadly this is needed as of now:
https://github.com/Cockatrice/Cockatrice/blob/ff6b0f86ec6d3bf76d6667003b82ce24479c0d15/cockatrice/src/releasechannel.cpp#L59-L68

* wrap asterisks

* fixed with validator

https://ci.appveyor.com/tools/validate-yaml

* complete link

* add helpful links

this should not trigger a appveyor build

* add space in readme

this should not trigger a appveyor build

* highlight c++ types

this should not trigger a appveyor build

* remove empty line

this should not trigger a appveyor build

* declutter dockerignore

this should not trigger a appveyor build