Add latest Stack Overflow survey results (yewstack#95)

docs/INTRODUCTION.md

@@ -35,7 +35,7 @@ It should be noted that using Wasm is not \(yet\) a silver bullet for improving
 
 #### Ok, but why Rust?
 
-Rust is blazing fast and reliable with its rich type system and ownership model. It has a tough learning curve but is well worth the effort. Rust has been voted the most loved programming language in Stack Overflow's Developer Survey four years in a row: [2016](https://insights.stackoverflow.com/survey/2016#technology-most-loved-dreaded-and-wanted), [2017](https://insights.stackoverflow.com/survey/2017#most-loved-dreaded-and-wanted), [2018](https://insights.stackoverflow.com/survey/2018#technology-_-most-loved-dreaded-and-wanted-languages) and [2019](https://insights.stackoverflow.com/survey/2019#technology-_-most-loved-dreaded-and-wanted-languages).
+Rust is blazing fast and reliable with its rich type system and ownership model. It has a tough learning curve but is well worth the effort. Rust has been voted the most loved programming language in Stack Overflow's Developer Survey five years in a row: [2016](https://insights.stackoverflow.com/survey/2016#technology-most-loved-dreaded-and-wanted), [2017](https://insights.stackoverflow.com/survey/2017#most-loved-dreaded-and-wanted), [2018](https://insights.stackoverflow.com/survey/2018#technology-_-most-loved-dreaded-and-wanted-languages), [2019](https://insights.stackoverflow.com/survey/2019#technology-_-most-loved-dreaded-and-wanted-languages) and [2020](https://insights.stackoverflow.com/survey/2020#most-loved-dreaded-and-wanted).
 
 Rust also helps developers write safer code with its rich type system and ownership model. Say goodbye to hard to track down race condition bugs in JavaScript! In fact, with Rust, most of your bugs will be caught by the compiler before your app even runs. And don't worry, when your app does run into an error, you can still get full stack-traces for your Rust code in the browser console.