Update README with min rustc version and update lazy_static version

.github/workflows/build.yml

@@ -113,6 +113,9 @@ jobs:
         run: |
           export PATH="$HOME/.cargo/bin:$PATH"
           cd src/rust/iced-x86
+          echo ==== UPDATE Cargo.lock ====
+          cargo +1.20.0 generate-lockfile
+          cargo +1.20.0 update --package lazy_static --precise 1.1.0
           echo ==== BUILD DEBUG ====
           cargo +1.20.0 build --color always
           echo ==== TEST DEBUG ====

src/rust/iced-x86/Cargo.toml

@@ -31,7 +31,7 @@ NASM_FORMATTER = []
 static_assertions = "0.3.4"
 
 [dev-dependencies]
-lazy_static = "1.1.*"
+lazy_static = "1.1.0"
 
 [build-dependencies]
 rustc_version = "0.2.3"

src/rust/iced-x86/README.md

@@ -1,3 +1,32 @@
-![Minimum rustc version](https://img.shields.io/badge/rustc-1.20+-yellow.svg)
+iced-x86
+[![Latest version](https://img.shields.io/crates/v/iced-x86.svg)](https://crates.io/crates/iced-x86)
+[![Documentation](https://docs.rs/iced-x86/badge.svg)](https://docs.rs/iced-x86)
+[![Minimum rustc version](https://img.shields.io/badge/rustc-1.20.0+-yellow.svg)](https://github.com/0xd4d/iced/tree/master/src/rust/iced-x86#rust-version-requirements)
+![License](https://img.shields.io/crates/l/iced-x86.svg)
+
+TODO:
+
+## Minimum supported `rustc` version
+
+iced-x86 supports `rustc` 1.20.0 or later.
+This is checked in CI builds where the minimum supported version and the latest stable version are used to build the source code and run tests.
+
+If you use an older version of `rustc`, you may need to update the versions of some iced-x86 dependencies because `cargo` prefers to use the latest version which may not support your `rustc`.
+Eg. iced-x86 needs `lazy_static` `1.1.0`, but `cargo` wants to use the latest version which is currently `1.4.0` and it doesn't support the minimum supported `rustc` version.
+Here's how you can force a compatible version of any iced-x86 dependency without updating iced-x86's `Cargo.toml`:
+
+```
+cargo generate-lockfile
+cargo update --package lazy_static --precise 1.1.0
+```
+
+## Breaking changes
+
+The following are considered minor breaking changes. At least the minor version of iced-x86 will be incremented.
+
+- Bumping the minimum supported version of `rustc`
+- Adding a new enum item (eg. support new instructions)
+- Sorting enum items
+- Adding new APIs (can cause problems with `use iced_x86::*;`)
 
 TODO: