Graph API Upgrade to v3.0

[simmatrix]

Upgraded Graph API to v3.0 as v2.6 would be deprecated on July 13, 2018

[codecov]

Codecov Report

Merging #67 into master will not change coverage.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master      #67   +/-   ##
=========================================
  Coverage     70.24%   70.24%           
  Complexity      381      381           
=========================================
  Files            34       34           
  Lines           941      941           
=========================================
  Hits            661      661           
  Misses          280      280

Impacted Files	Coverage Δ	Complexity Δ
src/FacebookDriver.php	82.58% <ø> (ø)	72 <0> (ø)	⬇️
src/Commands/WhitelistDomains.php	0% <0%> (ø)	4 <0> (ø)	⬇️
src/Commands/AddGreetingText.php	0% <0%> (ø)	4 <0> (ø)	⬇️
src/Commands/AddStartButtonPayload.php	0% <0%> (ø)	4 <0> (ø)	⬇️
src/Commands/AddPersistentMenu.php	0% <0%> (ø)	4 <0> (ø)	⬇️

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