chore(types) Add correct attributions.

lib/wasmer-types/README.md

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 # `wasmer-types` [![Build Status](https://github.com/wasmerio/wasmer/workflows/build/badge.svg?style=flat-square)](https://github.com/wasmerio/wasmer/actions?query=workflow%3Abuild) [![Join Wasmer Slack](https://img.shields.io/static/v1?label=Slack&message=join%20chat&color=brighgreen&style=flat-square)](https://slack.wasmer.io) [![MIT License](https://img.shields.io/github/license/wasmerio/wasmer.svg?style=flat-square)](https://github.com/wasmerio/wasmer/blob/master/LICENSE)
 
 This crate provides the basic structures to use WebAssembly easily anywhere.
+
+### Acknowledgments
+
+This project borrowed some of the code for the entity structure from [cranelift-entity](https://crates.io/crates/cranelift-entity).
+We decided to move it here to help on serialization/deserialization and also to ease the integration with other tools like `loupe`.
+
+Please check [Wasmer ATTRIBUTIONS](https://github.com/wasmerio/wasmer/blob/master/ATTRIBUTIONS.md) to further see licenses and other attributions of the project. 

lib/wasmer-types/src/entity/boxed_slice.rs

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+// This file contains code from external sources.
+// Attributions: https://github.com/wasmerio/wasmer/blob/master/ATTRIBUTIONS.md
+
 //! Boxed slices for `PrimaryMap`.
 
 use crate::entity::iter::{Iter, IterMut};

lib/wasmer-types/src/entity/iter.rs

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+// This file contains code from external sources.
+// Attributions: https://github.com/wasmerio/wasmer/blob/master/ATTRIBUTIONS.md
+
 //! A double-ended iterator over entity references and entities.
 
 use crate::entity::EntityRef;

lib/wasmer-types/src/entity/keys.rs

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+// This file contains code from external sources.
+// Attributions: https://github.com/wasmerio/wasmer/blob/master/ATTRIBUTIONS.md
+
 //! A double-ended iterator over entity references.
 //!
 //! When `core::iter::Step` is stabilized, `Keys` could be implemented as a wrapper around

lib/wasmer-types/src/entity/mod.rs

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+// This file contains code from external sources.
+// Attributions: https://github.com/wasmerio/wasmer/blob/master/ATTRIBUTIONS.md
+
 /// A type wrapping a small integer index should implement `EntityRef` so it can be used as the key
 /// of an `SecondaryMap` or `SparseMap`.
 pub trait EntityRef: Copy + Eq {

lib/wasmer-types/src/entity/packed_option.rs

@@ -1,7 +1,10 @@
+// This file contains code from external sources.
+// Attributions: https://github.com/wasmerio/wasmer/blob/master/ATTRIBUTIONS.md
+
 //! Compact representation of `Option<T>` for types with a reserved value.
 //!
-//! Small Cranelift types like the 32-bit entity references are often used in tables and linked
-//! lists where an `Option<T>` is needed. Unfortunately, that would double the size of the tables
+//! Small types are often used in tables and linked lists where an
+//! `Option<T>` is needed. Unfortunately, that would double the size of the tables
 //! because `Option<T>` is twice as big as `T`.
 //!
 //! This module provides a `PackedOption<T>` for types that have a reserved value that can be used

lib/wasmer-types/src/entity/primary_map.rs

@@ -1,3 +1,6 @@
+// This file contains code from external sources.
+// Attributions: https://github.com/wasmerio/wasmer/blob/master/ATTRIBUTIONS.md
+
 //! Densely numbered entity references as mapping keys.
 use crate::entity::boxed_slice::BoxedSlice;
 use crate::entity::iter::{IntoIter, Iter, IterMut};

lib/wasmer-types/src/entity/secondary_map.rs

@@ -1,3 +1,6 @@
+// This file contains code from external sources.
+// Attributions: https://github.com/wasmerio/wasmer/blob/master/ATTRIBUTIONS.md
+
 //! Densely numbered entity references as mapping keys.
 
 use crate::entity::iter::{Iter, IterMut};