fix: add isLoggable around parameterized logger

[jorsol]

Enclose Logger with isLoggable in multi-parameter cases.

[codecov-io]

Codecov Report

Merging #752 into master will decrease coverage by -0.26%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master     #752      +/-   ##
============================================
- Coverage     65.62%   65.36%   -0.26%     
+ Complexity     3502     3498       -4     
============================================
  Files           164      164              
  Lines         15091    15110      +19     
  Branches       2427     2442      +15     
============================================
- Hits           9903     9877      -26     
- Misses         4035     4062      +27     
- Partials       1153     1171      +18

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[davecramer]

thx!

[vlsi]

PS. I wish there was a source pre-processor that could automatically wrap logging statements at compile time.

PPS. Java annotation processors have no public API to alter source code (processors can just add new classes), so annotation processing can't help here.
Lombok uses some non-public API, so it might have issues with Java 9.