make edit in README.md (#18981)

README.md

diff --git a/README.md b/README.md
index acc09c1..fba05dd 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@
 
 Flutter's <em>hot reload</em> helps you quickly
 and easily experiment, build UIs, add features, and fix
-bugs faster. Experience sub-second reload times,
+bugs. Experience sub-second reload times,
 without losing state, on
 emulators, simulators, and hardware for iOS
 and Android.