Update README.md. There is "of" twice. (#284)

Author: e99h2121

README.md

@@ -92,7 +92,7 @@
 
   - A common language (for the two ends to understand)
   - A way to address who do you want to communicate with
-  - A Connection (so the content of of the communication can reach the recipients)
+  - A Connection (so the content of the communication can reach the recipients)
 </b></details>
 
 <details>