fix typos

Author: StefanSlehta

src/default-resolver.js

@@ -1,4 +1,4 @@
-export const defaultErrors = [{message: 'an unknown error has occured'}];
+export const defaultErrors = [{message: 'an unknown error has occured.'}];
 
 export default function defaultResolver(path) {
   const keys = path.split('.');

test/default-resolver-test.js

@@ -47,7 +47,7 @@ suite('default-resolver-test', () => {
     });
   });
 
-  test('it rejects with synthetic errors hash if no top level key available', () => {
+  test('it rejects with a synthetic errors hash if no top level key available', () => {
     const resolve = defaultResolver('node');
 
     return resolve({}).then(() => {