Include packages-dev

[felixfbecker]

Fixes #258

[codecov]

Codecov Report

Merging #282 into master will not impact coverage.

@@           Coverage Diff            @@
##             master    #282   +/-   ##
========================================
  Coverage      86.1%   86.1%           
  Complexity      723     723           
========================================
  Files            54      54           
  Lines          1461    1461           
========================================
  Hits           1258    1258           
  Misses          203     203

Impacted Files	Coverage Δ	Complexity Δ
src/Server/Workspace.php	87.5% <ø> (ø)	24 <ø> (ø)	❌
src/Server/TextDocument.php	98.01% <ø> (ø)	36 <ø> (ø)	❌

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