Update README.md: fix toc

README.md

@@ -19,17 +19,18 @@ Malware persistence consists of techniques that adversaries use to keep access t
     * [Generic](#generic-1)
     * [Windows](#windows-1)
 * [Detection Testing](#detection-testing)
-    * [Generic](#generic)
-    * [Linux](#linux)
-    * [macOS](#macos)
-    * [Windows](#windows)
-* [Prevention](#prevention)
-    * [macOS](#macos-1)
-* [Collection](#collection)
     * [Generic](#generic-2)
     * [Linux](#linux-1)
-    * [macOS](#macos-2)
+    * [macOS](#macos-1)
     * [Windows](#windows-2)
+* [Prevention](#prevention)
+    * [macOS](#macos-2)
+* [Collection](#collection)
+    * [Generic](#generic-3)
+    * [Linux](#linux-2)
+    * [macOS](#macos-3)
+    * [Windows](#windows-3)
+* [Contributing](#contributing)
 
 ## Techniques