fix typo

Author: SimonCropp

GitVersionTask/VersionAndBranchFinder.cs

@@ -15,7 +15,7 @@ public static bool TryGetVersion(string directory, out SemanticVersion versionAn
                 var message =
                     "No .git directory found in provided solution path. This means the assembly may not be versioned correctly. " +
                     "To fix this warning either clone the repository using git or remove the `GitVersionTask` nuget package. " +
-                    "To temporarily work around this issue add a AssemblyInfo.cs with an appropriate `AssemblyVersionAttribute`." +
+                    "To temporarily work around this issue add a AssemblyInfo.cs with an appropriate `AssemblyVersionAttribute`. " +
                     "If it is detected that this build is occurring on a CI server an error may be thrown.";
                 Logger.WriteWarning(message);
                 versionAndBranch = null;