message: Remove an error from Readme
diff: @@ -48,21 +48,3 @@ $ ./build.sh
  * cranelift-module api seems to be used wrong, thus causing panic for some consts
  * cranelift-codegen doesn't have encodings for some instructions for types smaller than I32
  -
  -```
  -[...]
  -warning: DefId(0/0:128 ~ lib[8787]::f64[0]::{{impl}}[0]::classify[0]):
  -fn f64::<impl at ./target/libcore/src/libcore/num/f64.rs:156:1: 490:2>::classify(_1: f64) -> num::FpCategory{
  -[...]
  -}
  -warning: stmt _3 = _1
  -warning: stmt _5 = BitAnd(move _6, const Unevaluated(DefId(0/0:130 ~ lib[8787]::f64[0]::{{impl}}[0]::classify[0]::MAN_MASK[0]), []):u64)
  -thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', libcore/option.rs:345:21
  -stack backtrace:
  -[...]
  - 10: <core::option::Option<T>>::unwrap
  - at /checkout/src/libcore/macros.rs:20
  - 11: rustc_codegen_cranelift::constant::trans_constant
  - at src/constant.rs:26
  -[...]
  -```
  