Update README.md

Liqiankun · web-flow · commit a012018ea4ef · 2020-04-01T09:52:20.000+08:00
diff --git a/README.md b/README.md
@@ -6,5 +6,5 @@
 * `react-native link`
 * `react-native run-ios --simulator='iPhone XS'`
 
-## Upgarde
+## Upgrade
 Time to upgrade to 0.62+. Coming soon!
