Build process fails in linux due to incorrect filename

Issue

Build fails due to a file not being found

╬══════════════════
║ Update Readme
╬═════════

FileNotFoundException: Could not find file '/home/eruizc/Repos/csharp-language-server-protocol/Readme.md'.
   at Interop.ThrowExceptionForIoErrno(ErrorInfo errorInfo, String path, Boolean isDirectory, Func`2 errorRewriter)
   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String path, OpenFlags flags, Int32 mode)
   at System.IO.FileStream.OpenHandle(FileMode mode, FileShare share, FileOptions options)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)
   at System.IO.StreamReader.ValidateArgsAndOpenPath(String path, Encoding encoding, Int32 bufferSize)
   at System.IO.StreamReader..ctor(String path, Encoding encoding, Boolean detectEncodingFromByteOrderMarks)
   at System.IO.File.InternalReadAllText(String path, Encoding encoding)
   at System.IO.File.ReadAllText(String path)
   at Rocket.Surgery.Nuke.EnsureReadmeIsUpdatedAttribute.OnAfterLogo(NukeBuild build, IReadOnlyCollection`1 executableTargets, IReadOnlyCollection`1 executionPlan) in /_/src/Nuke/EnsureReadmeIsUpdatedAttribute.cs:line 34
   at Nuke.Common.Utilities.Collections.EnumerableExtensions.ForEach[T](IEnumerable`1 enumerable, Action`1 action)
   at Nuke.Common.Execution.BuildManager.<>c__DisplayClass5_0`1.<Execute>g__ExecuteExtension|1[TExtension](Expression`1 action)
   at Nuke.Common.Execution.BuildManager.Execute[T](Expression`1[] defaultTargetExpressions)


Repeating warnings and errors:
FileNotFoundException: Could not find file '/home/eruizc/Repos/csharp-language-server-protocol/Readme.md'.

Repro steps

1. Clone the repo git clone git@github.com:OmniSharp/csharp-language-server-protocol.git
2. Set current dir cd csharp-language-server-protocol
3. Make build script executable sudo chmod +x ./build.sh
4. Attempt to run with sh sh -c ./build.sh
5. Fails

Workaround

It tries to update the readme but doesn't found it (it searches for Readme.md and the file is called README.md, so we rename it)
mv README.md Readme.md

Additional info:

I guess this has something to do with #226 but the error is different so I decided to create a new issue.

Start with build.sh and the stack-trace location in EnsureReadmeIsUpdatedAttribute.cs at line 34. Reproduce the build on Linux and compare the filename used by the build with the repository's README.md; done means the build completes without the FileNotFoundException.