Vendor dependencies

Let's see how I like this workflow.

vendor/crossterm/examples/is_tty.rs

@@ -0,0 +1,18 @@
+use crossterm::{
+    execute,
+    terminal::{size, SetSize},
+    tty::IsTty,
+};
+use std::io::{stdin, stdout};
+
+pub fn main() {
+    println!("{:?}", size().unwrap());
+    execute!(stdout(), SetSize(10, 10)).unwrap();
+    println!("{:?}", size().unwrap());
+
+    if stdin().is_tty() {
+        println!("Is TTY");
+    } else {
+        println!("Is not TTY");
+    }
+}