Migrate to pin_cell crate (#309)

Author: zbraniecki

fluent-fallback/Cargo.toml

@@ -25,6 +25,7 @@ unic-langid.workspace = true
 async-trait = "0.1"
 chunky-vec = "0.1"
 once_cell = "1.9"
+pin-cell = "0.2"
 
 [dev-dependencies]
 fluent-langneg.workspace = true

fluent-fallback/src/cache.rs

@@ -8,9 +8,9 @@ use std::{
 };
 
 use crate::generator::{BundleIterator, BundleStream};
-use crate::pin_cell::{PinCell, PinMut};
 use chunky_vec::ChunkyVec;
 use futures::{ready, Stream};
+use pin_cell::{PinCell, PinMut};
 
 pub struct Cache<I, R>
 where

fluent-fallback/src/lib.rs

@@ -110,7 +110,6 @@ pub mod env;
 mod errors;
 pub mod generator;
 mod localization;
-mod pin_cell;
 pub mod types;
 
 pub use bundles::Bundles;