docs: fix you->your typo (#26)

Author: stephenmathieson

README.md

@@ -30,7 +30,7 @@ You want to write maintainable tests for your React components. As a part of
 this goal, you want your tests to avoid including implementation details of
 your components and rather focus on making your tests give you the confidence
 for which they are intended. As part of this, you want your testbase to be
-maintainable in the long run so refactors of you components (changes to
+maintainable in the long run so refactors of your components (changes to
 implementation but not functionality) don't break your tests and slow you and
 your team down.