add missing dot

Author: greg0ire

README.md

@@ -175,7 +175,7 @@ git config --add hooks.enabled-plugins wipchecker
 
 ### Syntax checker hook
 
-Checks for syntax errors in files that have a checker, based on the file extension
+Checks for syntax errors in files that have a checker, based on the file extension.
 For the moment, there only is a php checker, located at `hooks/syntaxchecker/php/check.sh`.
 
 This hook is language-agnostic.