breakup the line for readability

README.md

@@ -91,8 +91,13 @@ s3proxy.keystore-path=keystore.jks
 s3proxy.keystore-password=password
 ```
 
-To setup the keystore, do `keytool -keystore keystore.jks -alias aws
--genkey -keyalg RSA`. Use `*.s3.amazonaws.com` if you wish to proxy
+To setup the keystore, do
+
+```
+$ keytool -keystore keystore.jks -alias aws -genkey -keyalg RSA
+```
+
+Use `*.s3.amazonaws.com` if you wish to proxy
 access to Amazon S3 itself. Applications will reject the self-signed
 certificate, unless you import it to the application's trusted
 store. If the application is written in Java, you can do: