Add ability to use semaphore bulkhead by default

[codecov[bot]]

Codecov Report

Merging #136 (f0cbf2e) into 2.1.x (a0f2f02) will increase coverage by 0.54%. The diff coverage is 90.00%.

@@             Coverage Diff              @@
##              2.1.x     #136      +/-   ##
============================================
+ Coverage     77.56%   78.10%   +0.54%     
- Complexity       81       85       +4     
============================================
  Files            14       14              
  Lines           361      370       +9     
  Branches         12       13       +1     
============================================
+ Hits            280      289       +9     
  Misses           77       77              
  Partials          4        4              

Impacted Files	Coverage Δ
...er/resilience4j/Resilience4JAutoConfiguration.java	50.00% <ø> (ø)
...ker/resilience4j/Resilience4jBulkheadProvider.java	94.11% <83.33%> (+0.63%)	:arrow_up:
...ilience4j/Resilience4JConfigurationProperties.java	76.92% <100.00%> (+10.25%)	:arrow_up:

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[wind57]

this will go to main also, right? because I could use that mockito extension for final classes/methods too in a diff PR. thank you for the answer

[ryanjbaxter]

Already there