wasmer-python: wasmer is not available on aarch64?

Describe the bug

I’m trying to run wasmer + wasmer-py on a RPi 3b+, running Ubuntu 20.04 (aarch64). I tried wasmer_compiler_llvm and wasmer_compiler_cranelift as backends, both of which throw the same error. Also, wasmer itself can be installed, but is not working from python.

Steps to reproduce

1. Clone this repo and go into this folder: https://github.com/proohit/nodejs-rust/tree/master/smartcore-wasi/python
2. Install dependencies pip install -r requirements.txt
3. Run python run-wasmer.py
4. See error

Expected behavior

I was expecting it to run, since aarch64 seems to be supported, according to the readme.

Actual behavior

$ python run-wasmer.py
Traceback (most recent call last):
  File "run-wasmer.py", line 1, in <module>
    from lib.python.glue import load_model
  File "/home/ubuntu/workspace/nodejs-rust/smartcore-wasi/python/lib/python/glue.py", line 1, in <module>
    from wasmer import engine, wasi, Store, Module, Instance
  File "/home/ubuntu/workspace/nodejs-rust/smartcore-wasi/python/env/lib/python3.8/site-packages/wasmer/__init__.py", line 1, in <module>
    raise ImportError("Wasmer is not available on this system")
ImportError: Wasmer is not available on this system

Additional context

$ uname -a
Linux raspberry 5.4.0-1035-raspi #38-Ubuntu SMP PREEMPT Tue Apr 20 21:37:03 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.2 LTS
Release:        20.04
Codename:       focal
$ python --version
Python 3.8.5
$ wasmer --version
wasmer 1.0.2