Update the number of rlib files (because ascii crate has been added)

tatsuya6502 · tatsuya6502 · commit b245874c30a0 · 2019-06-27T18:30:55.000+08:00
diff --git a/src/atcoder-env/installing-rust-crates.md b/src/atcoder-env/installing-rust-crates.md
@@ -143,6 +143,6 @@ $
 
 ```console
 $ find target/release/deps/ -name '*.rlib' | wc -l
-58   # この数字を確認
+59   # この数字を確認
 ```
 
