fix config doc typo (#3298)

nlfurniss · duailibe · commit cbed0f487f2f · 2017-11-20T18:26:33.000-02:00
diff --git a/docs/configuration.md b/docs/configuration.md
@@ -13,7 +13,7 @@ This means you can configure prettier via:
 The configuration file will be resolved starting from the location of the file being formatted,
 and searching up the file tree until a config file is (or isn't) found.
 
-The options to the configuration file are the same the [API options](options.md).
+The options to the configuration file are the same as the [API options](options.md).
 
 ## Basic Configuration
 
