fix: include btoa and graphql-iso-date deps in build

package.json

@@ -185,6 +185,7 @@
     "apollo-server-express",
     "async-exit-hook",
     "async-mutex",
+    "btoa",
     "bycontract",
     "bytes",
     "camelcase",
@@ -214,6 +215,7 @@
     "globby",
     "graphql",
     "graphql-directive",
+    "graphql-iso-date",
     "graphql-subscriptions-client",
     "graphql-tag",
     "graphql-type-json",
@@ -266,4 +268,4 @@
     "uuid-apikey",
     "xhr2"
   ]
-}
+}