fix memorySize option

fixes #43

Author: Mic92

README.md

@@ -83,10 +83,10 @@ set - otherwise you will need to start VM as root. On NixOS this can be achieved
 
 ## RAM
 
-By default qemu will allow at most 500MB of RAM, this can be increased using `virtualisation.memorySize`.
+By default qemu will allow at most 500MB of RAM, this can be increased using `virtualisation.memorySize` (size in megabyte).
 
 ```nix
-{ virtualisation.memorySize = "1024M"; }
+{ virtualisation.memorySize = 1024; }
 ```
 
 ## CPUs

examples/vm-resources.nix

@@ -1,6 +1,6 @@
 {
   virtualisation = {
     cores = 2;
-    memorySize = "1024M";
+    memorySize = 1024;
   };
 }

share/nixos-shell/nixos-shell.nix

@@ -117,7 +117,7 @@ in {
 
       virtualisation = {
         graphics = mkVMDefault false;
-        memorySize = mkVMDefault "700M";
+        memorySize = mkVMDefault 700;
 
         qemu.consoles = lib.mkIf (!config.virtualisation.graphics) ["tty0" "hvc0"];