robots.txt:   Add in some bad actor bots
diff --git a/robots.txt b/robots.txt
index a8575b0..dc73ac6 100644
--- a/robots.txt
+++ b/robots.txt
@@ -1,3 +1,18 @@
+User-agent: SemrushBot
+Disallow: /
+
+User-agent: BLEXBot
+Disallow: /
+
+User-agent: AhrefsBot
+Disallow: /
+
+User-agent: dotbot
+Disallow: /
+
+User-agent: MJ12bot
+Disallow: /
+
 User-agent: *
 Allow: index.php
 Disallow: /