Disallow usage of true in contentBase option

SpaceK33z · SpaceK33z · commit 4131be587bd5 · 2016-11-15T11:06:50.000+01:00
This gave a confusing error since it isn't really allowed.
diff --git a/lib/optionsSchema.json b/lib/optionsSchema.json
@@ -138,7 +138,9 @@
           "type": "array"
         },
         {
-          "type": "boolean"
+          "enum": [
+            false
+          ]
         },
         {
           "type": "number"
