Fix 'recommended' spelling in README (#109)

diff --git a/README.md b/README.md
index 83bc12f..e53035f 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@
 to pass these lints. The recommended lints include all the core lints.
 
 Finally, a third set [`flutter_lints`](https://pub.dev/packages/flutter_lints)
-extends the recommended set with additional recommencded Flutter-specific lints.
+extends the recommended set with additional recommended Flutter-specific lints.
 
 ## Where these lints are used