Fix typo in README.md

Change-Id: I7f7d80e0ab4b6e69d2537a523d9caff82360af42
diff --git a/README.md b/README.md
index 7935e3d..494b1f6 100644
--- a/README.md
+++ b/README.md
@@ -18,5 +18,5 @@
 * Alexander Simkin for the Russian translation.
 * BrowserStack for allowing me to use their awesome services in order to test the extension in multiple versions of Chrome and in different operating systems.
 
-## More documents
+## More documents
 * [For developers working on the extension](docs/development.md)