Document Coverity/Checks before release step (#558)

Author: Youw

HACKING.txt

@@ -4,6 +4,11 @@ Updating a Version:
 1. Update VERSION file.
 2. HID_API_VERSION_MAJOR/HID_API_VERSION_MINOR/HID_API_VERSION_PATCH in hidapi.h.
 
+Before firing a new release:
+1. Run the "Checks" Githtub Action
+2. Make sure no defects are found at: https://scan.coverity.com/projects/hidapi
+3. Fix if any
+
 Firing a new release:
 1. Update the Version (if not yet updated).
 2. Prepare the Release Notes.