Update type drivers for type key exists checks

[richdynamix]

Due to lack of checks of the existence of the type key within the matchesRequest() method of each child driver type we get similar errors to the following -

local.ERROR: Undefined index: type {"exception":"[object] (ErrorException(code: 0): Undefined index: type at /app/vendor/botman/driver-facebook/src/FacebookFileDriver.php:24)

local.ERROR: Undefined index: type {"exception":"[object] (ErrorException(code: 0): Undefined index: type at /app/vendor/botman/driver-facebook/src/FacebookAudioDriver.php:24)

local.ERROR: Undefined index: type {"exception":"[object] (ErrorException(code: 0): Undefined index: type at /app/vendor/botman/driver-facebook/src/FacebookImageDriver.php:24)

local.ERROR: Undefined index: type {"exception":"[object] (ErrorException(code: 0): Undefined index: type at /app/vendor/botman/driver-facebook/src/FacebookLocationDriver.php:24)

This PR resolves this issue by first checking for the existence of the type key.

[codecov[bot]]

Codecov Report

Merging #55 into master will not change coverage. The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #55   +/-   ##
=========================================
  Coverage     71.85%   71.85%           
- Complexity      346      358   +12     
=========================================
  Files            32       32           
  Lines           867      867           
=========================================
  Hits            623      623           
  Misses          244      244

Impacted Files	Coverage Δ	Complexity Δ
src/FacebookFileDriver.php	81.81% <100%> (ø)	23 <0> (+3)	:arrow_up:
src/FacebookAudioDriver.php	81.81% <100%> (ø)	23 <0> (+3)	:arrow_up:
src/FacebookImageDriver.php	81.81% <100%> (ø)	23 <0> (+3)	:arrow_up:
src/FacebookLocationDriver.php	81.25% <100%> (ø)	22 <0> (+3)	:arrow_up:

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