Fix formatting for PVS-Studio section in README

Author: perdrix52

README.md

@@ -64,6 +64,6 @@ one that is being kept up to date.
 You can download the 2.5.9 of this from [Visual Leak Detector](https://github.com/Azure/vld/releases/tag/v2.5.9).
 You should install it to C:\Program Files (x86)\Visual Leak Detector as that is the location that the DeepSkyStacker projects expect to find it.
 In the Visual Leak Detector installation wizard, be sure to check "Add VLD directory to your environmental path".
-###PVS-Studio
+### PVS-Studio
 We use [PVS-Studio](https://pvs-studio.com/en/pvs-studio/?utm_source=website&utm_medium=github&utm_campaign=open_source) for code quality checking.