Update PHP dependencies

[phil-davis]

$ composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 0 installs, 1 update, 0 removals
  - Updating dasprid/enum (1.0.2 => 1.0.3): Downloading (100%)         
Writing lock file
Generating autoload files

[codecov[bot]]

Codecov Report

Merging #194 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #194   +/-   ##
=========================================
  Coverage     68.10%   68.10%           
  Complexity       67       67           
=========================================
  Files            14       14           
  Lines           279      279           
=========================================
  Hits            190      190           
  Misses           89       89           

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