Support till php 7.3

[codedge]

• Update packages
• Update Travis CI
• Commit composer.lock

[codecov-io]

Codecov Report

Merging #53 into master will increase coverage by 0.13%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #53      +/-   ##
============================================
+ Coverage     22.92%   23.05%   +0.13%     
+ Complexity      139      127      -12     
============================================
  Files            14       14              
  Lines           397      386      -11     
============================================
- Hits             91       89       -2     
+ Misses          306      297       -9

Impacted Files	Coverage Δ	Complexity Δ
src/UpdaterServiceProvider.php	80.76% <0%> (-1.38%)	6% <0%> (-2%)
src/SourceRepositoryTypes/HttpRepositoryType.php	0% <0%> (ø)	27% <0%> (-2%)	⬇️
src/Listeners/SendUpdateSucceededNotification.php	0% <0%> (ø)	5% <0%> (-1%)	⬇️
src/SourceRepository.php	0% <0%> (ø)	11% <0%> (-2%)	⬇️
src/Listeners/SendUpdateAvailableNotification.php	0% <0%> (ø)	5% <0%> (-1%)	⬇️
src/AbstractRepositoryType.php	16.27% <0%> (+0.36%)	18% <0%> (-2%)	⬇️
src/SourceRepositoryTypes/GithubRepositoryType.php	61.03% <0%> (+1.54%)	25% <0%> (-2%)	⬇️

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