convert shell.nix to flake.nix

crates/servicepoint/README.md

@@ -22,7 +22,7 @@ servicepoint = "0.10.0"
 
 ## Examples
 
-```rust
+```rust should_panic
 fn main() {
     // establish connection
     let connection = servicepoint::Connection::open("172.23.42.29:2342")

crates/servicepoint/src/lib.rs

@@ -120,8 +120,7 @@ pub const PIXEL_COUNT: usize = PIXEL_WIDTH * PIXEL_HEIGHT;
 /// ```rust
 /// # use std::time::Instant;
 /// # use servicepoint::{Command, CompressionCode, FRAME_PACING, Origin, Bitmap};
-/// # let connection = servicepoint::Connection::open("172.23.42.29:2342")
-/// #     .expect("connection failed");
+/// # let connection = servicepoint::Connection::Fake;
 /// # let pixels = Bitmap::max_sized();
 /// loop {
 ///    let start = Instant::now();