Update crossterm requirement from 0.12 to 0.27 (#30)

Updates the requirements on [crossterm](https://github.com/crossterm-rs/crossterm) to permit the latest version.
- [Release notes](https://github.com/crossterm-rs/crossterm/releases)
- [Changelog](https://github.com/crossterm-rs/crossterm/blob/master/CHANGELOG.md)
- [Commits](crossterm-rs/crossterm@0.12.0...0.27.0)

---
updated-dependencies:
- dependency-name: crossterm
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

interactive-test/Cargo.toml

@@ -12,4 +12,4 @@ publish = false
 
 [dependencies]
 anes = { path = "../anes" }
-crossterm = "0.12"
+crossterm = "0.27"

interactive-test/src/main.rs

@@ -1,8 +1,9 @@
-use std::io::{self, Write};
-
 use anes::{execute, queue};
-
-pub use crossterm::Result;
+use crossterm::{
+    event::{self, Event, KeyCode, KeyEvent},
+    terminal::enable_raw_mode,
+};
+use std::io::{self, Result, Write};
 
 #[macro_use]
 mod macros;
@@ -30,7 +31,7 @@ where
 {
     execute!(w, anes::SwitchBufferToAlternate)?;
 
-    let _raw = crossterm::RawScreen::into_raw_mode()?;
+    enable_raw_mode()?;
 
     loop {
         queue!(
@@ -64,11 +65,19 @@ where
 }
 
 pub fn read_char() -> Result<char> {
-    crossterm::input().read_char()
+    loop {
+        if let Event::Key(KeyEvent {
+            code: KeyCode::Char(c),
+            ..
+        }) = event::read()?
+        {
+            return Ok(c);
+        }
+    }
 }
 
 pub fn buffer_size() -> Result<(u16, u16)> {
-    crossterm::terminal().size()
+    crossterm::terminal::size()
 }
 
 fn main() -> Result<()> {