docs: Fix wrong title

zdzc · web-flow · commit e0db987441b3 · 2019-07-27T22:14:48.000+07:00
fix #200
diff --git a/exercises/structs/README.md b/exercises/structs/README.md
@@ -1,4 +1,4 @@
-### Strings
+### Structs
 
 Rust has three struct types: a classic c struct, a tuple struct, and a unit struct.
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-### Strings`
	`1`	`+### Structs`
`2`	`2`
`3`	`3`	`Rust has three struct types: a classic c struct, a tuple struct, and a unit struct.`
`4`	`4`