Add base dependency

package.json

@@ -6,7 +6,8 @@
     "category": [ "Web", "Database" ],
     "dependencies": {
         "abstract-curry": ">= 3.0.0",
-        "ertools"       : ">= 3.0.0"
+        "ertools"       : ">= 3.0.0",
+        "base"          : ">= 2.0.0"
     },
     "compilerCompatibility": {
         "pakcs": ">= 2.0.0",