Use "/rest/api/2/search/jql" instead of "/rest/api/2/search" API call internally

[aik099]

Closes #247.

[codecov]

Codecov Report

❌ Patch coverage is 97.56098% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.51%. Comparing base (7328538) to head (8d5520f).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Jira/Api/Result.php	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #248      +/-   ##
============================================
- Coverage     84.99%   83.51%   -1.49%     
+ Complexity      213      208       -5     
============================================
  Files            10       10              
  Lines           693      558     -135     
============================================
- Hits            589      466     -123     
+ Misses          104       92      -12     

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