Fixes a bug in ProcessRunner

Asking for the exit code before the process has ended (or in the case of the timeout handling code, killed), will cause an exception.

src/Acoustics.Shared/ProcessRunner.cs

@@ -405,7 +405,7 @@ private void ProcessTimeout(string arguments, string workingDirectory, int retry
         {
             if (Log.IsVerboseEnabled())
             {
-                Log.Verbose(this.instanceId + ": Process timeout handling code. Exit code: " + this.process.ExitCode);
+                Log.Verbose(this.instanceId + ": Process timeout handling code... Attempting to kill process");
             }
 
             this.process.Refresh();