Merge pull request #8 from gemstone/timestamp-culture

Use invariant culture for double-to-string conversion when parsing timestamps

src/Gemstone.COMTRADE/Timestamp.cs

@@ -67,7 +67,7 @@ public Timestamp(string lineImage)
 
             seconds += milliseconds;
 
-            parts[^1] = seconds.ToString("00.000000");
+            parts[^1] = seconds.ToString("00.000000", CultureInfo.InvariantCulture);
 
             lineImage = string.Join(":", parts).RemoveWhiteSpace();