removed useless chars, prepared release

README

@@ -13,8 +13,8 @@ Installation
 Edit config.mk to match your local setup (slock is installed into
 the /usr/local namespace by default).
 
-Afterwards enter the following command to build and install slock (if
-necessary as root):
+Afterwards enter the following command to build and install slock
+(if necessary as root):
 
     make clean install