add links for installing II

Author: didierfred

README.md

@@ -1,8 +1,6 @@
 # SimpleModifyHeaders V 1.6
 
-Extension for firefox and chrome. 
-
-The extension can be install via [this link](https://addons.mozilla.org/fr/firefox/addon/simple-modify-header/) for firefox and via [this link](https://chrome.google.com/webstore/detail/simple-modify-headers/gjgiipmpldkpbdfjkgofildhapegmmic) for chrome
+Extension for firefox and chrome. (The extension can be install via [this link](https://addons.mozilla.org/fr/firefox/addon/simple-modify-header/) for firefox and via [this link](https://chrome.google.com/webstore/detail/simple-modify-headers/gjgiipmpldkpbdfjkgofildhapegmmic) for chrome)
 
 The extension rewrite the headers based on a rules table.