rename CLI option, `--config` to `--app`

[komuw]

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Now,

What(What have you changed?)

• rename CLI option, --config to --app

Why(Why did you change it?)

• since the file is the residency of a wiji.app.App instance
• fixes: https://github.com/komuw/wiji/issues/51

References:

[codecov-io]

Codecov Report

Merging #52 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   78.69%   78.69%           
=======================================
  Files          14       14           
  Lines         859      859           
=======================================
  Hits          676      676           
  Misses        183      183

Impacted Files	Coverage Δ
wiji/__version__.py	100% <ø> (ø)	:arrow_up:
cli/cli.py	56.25% <100%> (ø)	:arrow_up:

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