cargo install command required min version of rustc does not fit the readme

[Dameng]

When I run cargo install amp, I got this error:

error: failed to compile `amp v0.6.2`, intermediate artifacts can be found at `/tmp/cargo-installdwyAC0`

Caused by:
  package `addr2line v0.21.0` cannot be built because it requires rustc 1.65 or newer, while the currently active rustc version is 1.63.0

The readme said version >=1.38, I think It should be updated.