since the last bit of unsafe has been removed, we can use forbid(unsa…

…fe_code)

src/lib.rs

@@ -1,4 +1,5 @@
 #![deny(trivial_casts, trivial_numeric_casts, rust_2018_idioms)]
+#![forbid(unsafe_code)]
 
 pub mod blocks;
 pub mod decoding;