Add base dependency

package.json

@@ -7,7 +7,8 @@
     "license": "BSD-3-Clause",
     "licenseFile": "LICENSE",
     "dependencies": {
-        "flatcurry": ">= 3.0.0"
+        "flatcurry": ">= 3.0.0",
+        "base"     : ">= 2.0.0"
     },
     "compilerCompatibility": {
         "pakcs": ">= 2.0.0"