Merge pull request OmniSharp#1354 from josteink/master

Fix typo in error-message.

src/OmniSharp.MSBuild/ProjectManager.cs

@@ -342,7 +342,7 @@ private void UpdateProject(string projectFilePath)
         {
             if (!_projectFiles.TryGetValue(projectFilePath, out var projectFileInfo))
             {
-                _logger.LogError($"Attemped to update project that is not loaded: {projectFilePath}");
+                _logger.LogError($"Attempted to update project that is not loaded: {projectFilePath}");
                 return;
             }