Fix typo in README.md

Change-Id: Id6ab39ab8f3ac504a97267e0653325e15de0dd8e

README.md

diff --git a/README.md b/README.md
index b4becdd..4b2a2ee 100644
--- a/README.md
+++ b/README.md
@@ -13,5 +13,5 @@
 file provides placoholders for it.
 
 Note: it is expected, that this repository is used only during transition
-period (Polymer 2 -> Polymer 3). After the transitition is complete (including Plugins),
-the submodule will be removed from gerrit repository.
\ No newline at end of file
+period (Polymer 2 -> Polymer 3). After the transition is complete (including plugins),
+the submodule will be removed from gerrit repository.