pip3 invalid command 'bdist_wheel' but successful installation

Question

I want to install future with pip3 but get the following error which ends up with successful installation.

$ pip3 --version
pip 18.1 from /usr/lib/python3/dist-packages/pip (python 3.7)
$ pip3 install --user future
Collecting future
  Using cached https://files.pythonhosted.org/packages/45/0b/38b06fd9b92dc2b68d58b75f900e97884c45bedd2ff83203d933cf5851c9/future-0.18.2.tar.gz
Building wheels for collected packages: future
  Running setup.py bdist_wheel for future ... error
  Complete output from command /usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-3c2ckni_/future/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/pip-wheel-1lzm4kl5 --python-tag cp37:
  usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
     or: -c --help [cmd1 cmd2 ...]
     or: -c --help-commands
     or: -c cmd --help

  error: invalid command 'bdist_wheel'

  ----------------------------------------
  Failed building wheel for future
  Running setup.py clean for future
Failed to build future
Installing collected packages: future
  Running setup.py install for future ... done
Successfully installed future-0.18.2

I would like to know if something is wrong or I can ignore that. When I use import future I don't get "no module" error. Any comment for that?