Fix docs for Runner class and file headers everywhere

[swissspidy]

Fixes #126.

Checklist:

• [x] My code is tested.
• [x] My code follows the WordPress code style.
• [x] My code has proper inline documentation.

[codecov-io]

Codecov Report

Merging #128 into master will increase coverage by 0.19%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #128      +/-   ##
============================================
+ Coverage     77.86%   78.05%   +0.19%     
- Complexity      332      333       +1     
============================================
  Files            23       23              
  Lines           795      802       +7     
============================================
+ Hits            619      626       +7     
  Misses          176      176

Impacted Files	Coverage Δ	Complexity Δ
inc/WebhookHandler/GitHub.php	100% <ø> (ø)	12 <0> (ø)	:arrow_down:
inc/Loader/Base.php	100% <ø> (ø)	2 <0> (ø)	:arrow_down:
inc/RepositoryFactory.php	100% <ø> (ø)	12 <0> (ø)	:arrow_down:
inc/Repository/GitHub.php	100% <ø> (ø)	5 <0> (ø)	:arrow_down:
inc/WebhookHandler/Bitbucket.php	97.29% <ø> (ø)	12 <0> (ø)	:arrow_down:
inc/Repository/Bitbucket.php	96.77% <ø> (ø)	19 <0> (ø)	:arrow_down:
inc/Updater.php	95% <ø> (ø)	22 <0> (ø)	:arrow_down:
inc/Repository/Base.php	87.5% <ø> (ø)	25 <0> (ø)	:arrow_down:
inc/ZipProvider.php	98.88% <ø> (+0.09%)	27 <0> (+1)	:arrow_up:
inc/WebhookHandlerFactory.php	100% <ø> (ø)	5 <0> (ø)	:arrow_down:
... and 14 more

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