Typo in loader.load() error message (#242)

Author: Caerbannog

src/__tests__/abuse.test.js

@@ -36,15 +36,15 @@ describe('Provides descriptive error messages for API abuse', () => {
       // $FlowExpectError
       idLoader.load();
     }).toThrow(
-      'The loader.load() function must be called with a value,' +
+      'The loader.load() function must be called with a value, ' +
       'but got: undefined.'
     );
 
     expect(() => {
       // $FlowExpectError
       idLoader.load(null);
     }).toThrow(
-      'The loader.load() function must be called with a value,' +
+      'The loader.load() function must be called with a value, ' +
       'but got: null.'
     );
 

src/index.js

@@ -74,7 +74,7 @@ class DataLoader<K, V, C = K> {
   load(key: K): Promise<V> {
     if (key === null || key === undefined) {
       throw new TypeError(
-        'The loader.load() function must be called with a value,' +
+        'The loader.load() function must be called with a value, ' +
         `but got: ${String(key)}.`
       );
     }