Added Facebook Broadcasts API coverage

[arsengoian]

Hi! I just added coverage for Facebook Broadcasts API (sending messages to groups of users) and labeling, according to documentation.

Broadcast reach evaluation and some minor features were not implemented.

Tests with complete coverage for the new features are included in PR.

MAIN DOC

TARGETING BROADCASTS DOC

[codecov-io]

Codecov Report

Merging #174 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #174   +/-   ##
=========================================
  Coverage     15.78%   15.78%           
  Complexity      190      190           
=========================================
  Files            23       23           
  Lines           646      646           
=========================================
  Hits            102      102           
  Misses          544      544

Impacted Files	Coverage Δ	Complexity Δ
FbBotApp.php	0% <ø> (ø)	46 <0> (ø)	⬇️

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[arsengoian]

Oops I didn't see the tests coming. I think tests should be moved to a different namespace, right?

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 15.78%. Comparing base (67f8c56) to head (dc6498a).
⚠️ Report is 8 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #174   +/-   ##
=========================================
  Coverage     15.78%   15.78%           
  Complexity      190      190           
=========================================
  Files            23       23           
  Lines           646      646           
=========================================
  Hits            102      102           
  Misses          544      544           

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