Update Readme.md for the fixed abi compatibility

Author: bjorn3

Readme.md

@@ -1,6 +1,4 @@
-# WIP Cranelift codegen backend for rust
-
-> ⚠⚠⚠ Certain kinds of FFI don't work yet. ⚠⚠⚠
+# Cranelift codegen backend for rust
 
 The goal of this project is to create an alternative codegen backend for the rust compiler based on [Cranelift](https://github.com/bytecodealliance/wasmtime/blob/main/cranelift).
 This has the potential to improve compilation times in debug mode.
@@ -103,7 +101,6 @@ function jit_calc() {
 
 ## Not yet supported
 
-* Good non-rust abi support ([several problems](https://github.com/bjorn3/rustc_codegen_cranelift/issues/10))
 * Inline assembly ([no cranelift support](https://github.com/bytecodealliance/wasmtime/issues/1041)
     * On Linux there is support for invoking an external assembler for `global_asm!` and `asm!`.
       `llvm_asm!` will remain unimplemented forever. `asm!` doesn't yet support reg classes. You