Update errors.md

Author: mmerkes

src/tutorial/errors.md

@@ -3,7 +3,7 @@
 We all can do nothing but accept the fact that errors will occur.
 In contrast to many other languages,
 it's very hard not to notice and deal with this reality
-when using Rust since it doesn't have exceptions.
+when using Rust because it doesn't have exceptions.
 All possible error states are often encoded in the return types of functions.
 
 ## Results