Fix relative links in highlighters readme

highlighters/README.md

@@ -3,11 +3,11 @@ zsh-syntax-highlighting / highlighters
 
 Syntax highlighting is done by pluggable highlighters:
 
-* [***main***](highlighters/main) - the base highlighter, and the only one active by default.
-* [***brackets***](highlighters/brackets) - matches brackets and parenthesis.
-* [***pattern***](highlighters/pattern) - matches user-defined patterns.
-* [***cursor***](highlighters/cursor) - matches the cursor position.
-* [***root***](highlighters/root) - triggered if the current user is root.
+* [***main***](main) - the base highlighter, and the only one active by default.
+* [***brackets***](brackets) - matches brackets and parenthesis.
+* [***pattern***](pattern) - matches user-defined patterns.
+* [***cursor***](cursor) - matches the cursor position.
+* [***root***](root) - triggered if the current user is root.
 
 
 How to activate highlighters