issues/50:: create function decorator

[komuw]

Thank you for contributing to wiji.
Every contribution to wiji is important.

Contributor offers to license certain software (a “Contribution” or multiple
“Contributions”) to wiji, and wiji agrees to accept said Contributions,
under the terms of the MIT License.
Contributor understands and agrees that wiji shall have the irrevocable and perpetual right to make
and distribute copies of any Contribution, as well as to create and distribute collective works and
derivative works of any Contribution, under the MIT License.

Now,

What(What have you changed?)

Why(Why did you change it?)

• Fixes: create function decorator #50

References:

[codecov-io]

Codecov Report

Merging #83 into master will decrease coverage by 0.92%.
The diff coverage is 15.38%.

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
- Coverage   79.11%   78.18%   -0.93%     
==========================================
  Files          14       14              
  Lines         881      894      +13     
==========================================
+ Hits          697      699       +2     
- Misses        184      195      +11

Impacted Files	Coverage Δ
wiji/app.py	78.94% <ø> (ø)	⬆️
wiji/task.py	73.19% <15.38%> (-2.71%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 80a3aaf...29fdfb1. Read the comment docs.

[komuw]

This is weird.

@task_decor(the_broker=InMemoryBroker(), queue_name="q1")
async def hello():
    print("hello world.")
    await hello().delay()

await hello().delay()

calling a function like; hello().delay() instead of hello.delay().

this may lead to a lot of confusion/questions and weird error messages.
the func decorator may not be worth it.