Let exceptions to bubble

[nerg4l]

This PR allows exceptions (mainly GuzzleException) to bubble up to the caller of the client instance. Previous implementation swallowed it which made it hard to debug.

[codecov]

Codecov Report

Merging #4 into master will increase coverage by 1.82%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master       #4      +/-   ##
============================================
+ Coverage     96.98%   98.81%   +1.82%     
- Complexity       57       58       +1     
============================================
  Files             1        2       +1     
  Lines           166      169       +3     
============================================
+ Hits            161      167       +6     
+ Misses            5        2       -3     

Flag	Coverage Δ	Complexity Δ
#unittests	98.81% <100.00%> (+1.82%)	58.00 <2.00> (+1.00)

Impacted Files	Coverage Δ	Complexity Δ
src/BroadcasttClient.php	98.78% <100.00%> (+1.79%)	56.00 <0.00> (-1.00)	⬆️
src/Exception/JsonEncodeException.php	100.00% <100.00%> (ø)	2.00 <2.00> (?)

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