Sync PR builds not occurring during CI on AppVeyor

[atifaziz]

Unfortunately, once PR #104 was merged, the build failed on master due to compilation errors:

C:\projects\docopt-net\src\DocoptNet\Docopt.cs(174,88): error CS1503: Argument 2: cannot convert from 'DocoptNet.Value' to 'DocoptNet.ValueObject' [C:\projects\docopt-net\src\DocoptNet\DocoptNet.csproj]
C:\projects\docopt-net\src\DocoptNet\Docopt.cs(175,123): error CS1503: Argument 4: cannot convert from 'DocoptNet.Value' to 'DocoptNet.ValueObject' [C:\projects\docopt-net\src\DocoptNet\DocoptNet.csproj]
C:\projects\docopt-net\src\DocoptNet\Docopt.cs(174,88): error CS1503: Argument 2: cannot convert from 'DocoptNet.Value' to 'DocoptNet.ValueObject' [C:\projects\docopt-net\src\DocoptNet\DocoptNet.csproj]
C:\projects\docopt-net\src\DocoptNet\Docopt.cs(175,123): error CS1503: Argument 4: cannot convert from 'DocoptNet.Value' to 'DocoptNet.ValueObject' [C:\projects\docopt-net\src\DocoptNet\DocoptNet.csproj]
C:\projects\docopt-net\src\DocoptNet\Docopt.cs(174,88): error CS1503: Argument 2: cannot convert from 'DocoptNet.Value' to 'DocoptNet.ValueObject' [C:\projects\docopt-net\src\DocoptNet\DocoptNet.csproj]
C:\projects\docopt-net\src\DocoptNet\Docopt.cs(175,123): error CS1503: Argument 4: cannot convert from 'DocoptNet.Value' to 'DocoptNet.ValueObject' [C:\projects\docopt-net\src\DocoptNet\DocoptNet.csproj]
C:\projects\docopt-net\src\DocoptNet\Docopt.cs(182,20): error CS8619: Nullability of reference types in value of type 'TSource[]' doesn't match target type 'IEnumerable<T>'. [C:\projects\docopt-net\src\DocoptNet\DocoptNet.csproj]
C:\projects\docopt-net\src\DocoptNet\Docopt.cs(174,88): error CS1503: Argument 2: cannot convert from 'DocoptNet.Value' to 'DocoptNet.ValueObject' [C:\projects\docopt-net\src\DocoptNet.Playground\DocoptNet.Playground.csproj]
C:\projects\docopt-net\src\DocoptNet\Docopt.cs(175,123): error CS1503: Argument 4: cannot convert from 'DocoptNet.Value' to 'DocoptNet.ValueObject' [C:\projects\docopt-net\src\DocoptNet.Playground\DocoptNet.Playground.csproj]

From what I understand, AppVeyor builds are triggered on:

• push to branch
• merge PR to branch
• open PR
• sync PR (when you do push to branch with open PR)

It seems that PR #105 was merged into master before, but did not trigger a build for PR #104 that was also targeting the same branch (sync PR case above). Had that happened then the build errors would have been caught before breaking master.

/cc @voieducode

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