fix: typo (#720)

README.md

@@ -24,7 +24,7 @@
 
 Pinia works both for Vue 2.x and Vue 3.x. It requires Vue 2 with the latest `@vue/composition-api` or Vue `^3.2.0-0`.
 
-Pinia is is the most similar English pronunciation of the word _pineapple_ in Spanish: _piña_. A pineapple is in reality a group of individual flowers that join together to create a multiple fruit. Similar to stores, each one is born individually, but they are all connected at the end. It's also a delicious tropical fruit indigenous to South America.
+Pinia is the most similar English pronunciation of the word _pineapple_ in Spanish: _piña_. A pineapple is in reality a group of individual flowers that join together to create a multiple fruit. Similar to stores, each one is born individually, but they are all connected at the end. It's also a delicious tropical fruit indigenous to South America.
 
 ## 👉 [Demo on CodeSandbox](https://y4dfi.csb.app)