Refine anti-spam terminology in readme

Updated text to remove hyphen from 'anti-spam' and replace with 'antispam' for consistency. See https://app.doboard.com/1/task/47774

Author: shagimuratov

readme.txt

@@ -7,11 +7,11 @@ Requires PHP: 7.2
 Stable tag: 6.78
 License: GPLv2
 
-Top-rated anti-spam protection for WordPress, eCommerce. Blocks spam on forms, comments and registrations automatically. No CAPTCHA.
+Top-rated anti spam protection for WordPress, eCommerce. Blocks spam on forms, comments and registrations automatically. No CAPTCHA.
 
 == Description ==
 
-Top-rated anti-spam protection for WordPress. No CAPTCHA, no puzzles, and no visitor friction - just automatic spam blocking for forms, comments, registrations, subscriptions, and fake orders.
+Top-rated antispam protection for WordPress. No CAPTCHA, no puzzles, and no visitor friction - just automatic spam blocking for forms, comments, registrations, subscriptions, and fake orders.
 
 = Anti-Spam features =
 1. Stops spam comments.
@@ -35,7 +35,7 @@ Top-rated anti-spam protection for WordPress. No CAPTCHA, no puzzles, and no vis
 19. Spam FireWall, wich includes Anti-Crawler & Anti-Flood options.
 21. Hide «Website» field for comments.
 22. Block messages by languages, countries, networks and stop words.
-23. Email Address Encoder - protection for email addresses published on your site.
+23. Email Address Encoder - antispam protection for email addresses published on your site.
 24. No jQuery.
 
 = Free trial then $12 per year =