Fix subject-verb agreement in introduction section

javascript/computer_science/time_complexity.md

@@ -1,6 +1,6 @@
 ### Introduction
 
-You've written a lot of code up to this point, and you've hopefully moved on from just trying to write code that works, to now considering code readability and maintainability. You might spend some time considering how you can create the necessary abstractions so that your code stays easy to work with even as the requirements for it grows.
+You've written a lot of code up to this point, and you've hopefully moved on from just trying to write code that works, to now considering code readability and maintainability. You might spend some time considering how you can create the necessary abstractions so that your code stays easy to work with even as the requirements for it grow.
 
 Code readability and maintainability are super important. After all, you will likely spend as much, if not more, time reading code than writing it. You need to make sure new features are integrated with ease.