Merge pull request #1566 from nodiscc/makefile-composer-install

doc/Makefile: remove references to composer update

diff --combined Makefile
index 4c9a9c832d8bf428830f2037923f7d34e15431bf,d16639265ecc1516e10cc9881a1f28ae6389ba7a..0ff6bd3f7a5ef59ed7900b29a3b093855352b928
--- 1/Makefile
--- 2/Makefile
+++ b/Makefile
@@@ -3,7 -3,7 +3,7 @@@
  
  BIN = vendor/bin
  
 -all: static_analysis_summary check_permissions test
 +all: check_permissions test
  
  ##
  # Docker test adapter
@@@ -85,6 -85,10 +85,10 @@@ all_tests: test locale_test_de_DE local
        @# --text doesn't work with phpunit 4.* (v5 requires PHP 5.6)
        @#$(BIN)/phpcov merge --text coverage/txt coverage
  
+ ### download 3rd-party PHP libraries, including dev dependencies
+ composer_dependencies_dev: clean
+       composer install --prefer-dist
+ 
  ##
  # Custom release archive generation
  #