Fix broken link

HanKruiger · HanKruiger · commit e1422c644371 · 2019-05-26T14:45:04.000+02:00
diff --git a/exercises/modules/README.md b/exercises/modules/README.md
@@ -4,4 +4,4 @@ In this section we'll give you an introduction to Rust's module system.
 
 #### Book Sections
 
-- [The Module System](https://doc.rust-lang.org/stable/book/ch07-02-modules-and-use-to-control-scope-and-privacy.html)
+- [The Module System](https://doc.rust-lang.org/stable/book/ch07-02-defining-modules-to-control-scope-and-privacy.html)

Original file line number	Diff line number	Diff line change
`@@ -4,4 +4,4 @@ In this section we'll give you an introduction to Rust's module system.`
`4`	`4`
`5`	`5`	`#### Book Sections`
`6`	`6`
`7`		`-- [The Module System](https://doc.rust-lang.org/stable/book/ch07-02-modules-and-use-to-control-scope-and-privacy.html)`
	`7`	`+- [The Module System](https://doc.rust-lang.org/stable/book/ch07-02-defining-modules-to-control-scope-and-privacy.html)`