Update README.md

Remove "coverity" badge and add "Codacy" instead
Update SE link to https + now points to help page which is more useful

README.md

@@ -4,9 +4,9 @@
 
 [![GitHub version](https://img.shields.io/github/release/SubtitleEdit/subtitleedit.svg)](https://github.com/SubtitleEdit/subtitleedit)
 [![Build status](https://img.shields.io/appveyor/ci/SubtitleEdit/subtitleedit/master.svg)](https://ci.appveyor.com/project/SubtitleEdit/subtitleedit/branch/master)
-[![Coverity Scan Build Status](https://img.shields.io/coverity/scan/2562.svg)](https://scan.coverity.com/projects/2562)  
+[![Codacy Badge](https://api.codacy.com/project/badge/Grade/302c7f2e44194d2b9b43d49d085b5c6b)](https://www.codacy.com/app/niksedk/subtitleedit?utm_source=github.com&utm_medium=referral&utm_content=SubtitleEdit/subtitleedit&utm_campaign=Badge_Grade)
 ![SE number of downloads](https://img.shields.io/github/downloads/subtitleedit/subtitleedit/latest/total.svg)
 [![SE](https://img.shields.io/badge/SUBTITLE%20EDIT-join%20chat-blue.svg)](https://gitter.im/SubtitleEdit/subtitleedit "Subtitle Edit Gitter Chatroom")
 [![download latest release](https://img.shields.io/badge/SUBTITLE%20EDIT-download-000F39.svg)](https://github.com/SubtitleEdit/subtitleedit/releases/latest) 
 
-<http://www.nikse.dk/SubtitleEdit/>
+<https://www.nikse.dk/SubtitleEdit/Help>