feat: support log level && only support 8.x+

[atian25]

BREAK_CHANGE: console.debug only support at 8+

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@aaab899). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master     #3   +/-   ##
=======================================
  Coverage          ?   100%           
=======================================
  Files             ?      1           
  Lines             ?     63           
  Branches          ?      0           
=======================================
  Hits              ?     63           
  Misses            ?      0           
  Partials          ?      0

Impacted Files	Coverage Δ
index.js	100% <100%> (ø)

---

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@aaab899). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master     #3   +/-   ##
=======================================
  Coverage          ?   100%           
=======================================
  Files             ?      1           
  Lines             ?     58           
  Branches          ?      0           
=======================================
  Hits              ?     58           
  Misses            ?      0           
  Partials          ?      0

Impacted Files	Coverage Δ
index.js	100% <100%> (ø)

---

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 aaab899...8bd756a. Read the comment docs.

[popomore]

• zlogger@2.0.0