Typo

docs/install-update.md

@@ -55,7 +55,7 @@ docker rm $(docker ps -a -q)
 
 ### Step 2
 
-When upgrading from a version older than May 13th, 2017 to a version released after that date, you need to run the following command first as network settings have been changes:
+When upgrading from a version older than May 13th, 2017 to a version released after that date, you need to run the following command first as network settings have been changed:
 
 ```
 docker-compose down