Fix missing functions in API

Author: mringer

src/index.ts

@@ -1,11 +1,13 @@
 import { usePromise } from './promise';
-import { combineResolvers } from './helper';
+import { combineResolvers, and, or } from './helper';
 import { createExpressContext } from './context';
 import { createResolver } from './resolver';
 
 export {
   usePromise,
   combineResolvers,
   createExpressContext,
-  createResolver
+  createResolver,
+  and,
+  or
 };

test/unit/index_spec.js

@@ -1,7 +1,7 @@
 import { expect } from 'chai';
 
 import {
-  combineResolvers
+  combineResolvers, and, or
 } from '../../dist/helper';
 
 import {
@@ -24,7 +24,9 @@ describe('(unit) dist/index.js', () => {
       combineResolvers,
       usePromise,
       createExpressContext,
-      createResolver
+      createResolver,
+      and,
+      or
     });
   })
 })