Cannot build

[velvia]

Hey Jorge,

Great work. I can't build it though, when I clone and repo and run Maturin develop I get:

  Compiling indoc-impl v0.3.6
   Compiling ghost v0.1.2
   Compiling tokio-macros v0.2.6
   Compiling inventory-impl v0.1.10
   Compiling ctor v0.1.20
   Compiling pyo3cls v0.12.4
   Compiling indoc v0.3.6
   Compiling tokio v0.2.25
   Compiling futures-util v0.3.14
   Compiling thiserror v1.0.24
   Compiling flatbuffers v0.8.4
error[E0658]: const generics are unstable======================>     ] 204/222: async-trait, packed_s...
  --> /Users/evan/.cargo/registry/src/github.com-1ecc6299db9ec823/flatbuffers-0.8.4/src/array.rs:28:35
   |
28 | pub struct Array<'a, T: 'a, const N: usize>(&'a [u8], PhantomData<T>);
   |                                   ^
   |
   = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
   = help: add `#![feature(min_const_generics)]` to the crate attributes to enable


error[E0658]: const generics are unstable======================>     ] 204/222: async-trait, packed_s...
  --> /Users/evan/.cargo/registry/src/github.com-1ecc6299db9ec823/flatbuffers-0.8.4/src/array.rs:30:23
   |
30 | impl<'a, T: 'a, const N: usize> Debug for Array<'a, T, N>
   |                       ^
   |
   = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
   = help: add `#![feature(min_const_generics)]` to the crate attributes to enable


error[E0658]: const generics are unstable======================>     ] 204/222: async-trait, packed_s...
  --> /Users/evan/.cargo/registry/src/github.com-1ecc6299db9ec823/flatbuffers-0.8.4/src/array.rs:40:23
   |
40 | impl<'a, T: 'a, const N: usize> Array<'a, T, N> {
   |                       ^
   |
   = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
   = help: add `#![feature(min_const_generics)]` to the crate attributes to enable


error[E0658]: const generics are unstable
  --> /Users/evan/.cargo/registry/src/github.com-1ecc6299db9ec823/flatbuffers-0.8.4/src/array.rs:57:36
   |
57 | impl<'a, T: Follow<'a> + 'a, const N: usize> Array<'a, T, N> {
   |                                    ^
   |
   = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
   = help: add `#![feature(min_const_generics)]` to the crate attributes to enable

It seems maybe this has to do with using an older nightly. Maybe try a newer one?
(NOTE: I tried a newer one but then ran into linker problems. I'm using OSX 10.15.7)