Adaptive stepsize seems to be working

Cargo.toml

@@ -6,3 +6,9 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+serde = { version = "1.0", features = ["derive"] }
+nalgebra = { version = "0.32", features = ["serde-serialize"] }
+num-traits = "0.2.15"
+
+[dev-dependencies]
+approx = "0.5"