Changed requirement

README.md

@@ -125,7 +125,7 @@ Task fails with `Process exited with code null`, no task console output | If the
 On Windows, docker-compose fails with `Failed to execute the script docker-compose` | Make sure you have enabled VT-x virtualization in the BIOS
 Cannot access WebODM using Microsoft Edge on Windows 10 | Try to tweak your internet properties according to [these instructions](http://www.hanselman.com/blog/FixedMicrosoftEdgeCantSeeOrOpenVirtualBoxhostedLocalWebSites.aspx)
 Getting a `No space left on device` error, but hard drive has enough space left | Docker on Windows by default will allocate only 20GB of space to the default docker-machine. You need to increase that amount. See [this link](http://support.divio.com/local-development/docker/managing-disk-space-in-your-docker-vm) and [this link](https://www.howtogeek.com/124622/how-to-enlarge-a-virtual-machines-disk-in-virtualbox-or-vmware/)
-Cannot start WebODM via `./webodm.sh start`, error messages are different at each retry | You could be running out of memory. Make sure you have enough RAM available. 4GB should be the recommended minimum, unless you know what you are doing
+Cannot start WebODM via `./webodm.sh start`, error messages are different at each retry | You could be running out of memory. Make sure you have enough RAM available. 2GB should be the recommended minimum, unless you know what you are doing
 
 Have you had other issues? Please [report them](https://github.com/OpenDroneMap/WebODM/issues/new) so that we can include them in this document.