Merge pull request #3987 from calvintam236/develop

[ci skip] Fixed a typo in tests/README.md
diff --git a/tests/README.md b/tests/README.md
index 47b5241..04dfbc3 100644
--- a/tests/README.md
+++ b/tests/README.md
@@ -6,7 +6,7 @@
 
 This is the preliminary CodeIgniter testing documentation. It
 will cover both internal as well as external APIs and the reasoning
-behind their implemenation, where appropriate. As with all CodeIgniter
+behind their implementation, where appropriate. As with all CodeIgniter
 documentation, this file should maintain a mostly human readable
 format to facilitate clean api design. [see http://arrenbrecht.ch/testing/]