Merge pull request #4256 from alcohol/master

composer: up 1.6.x to latest version

library/composer

@@ -3,8 +3,8 @@
 Maintainers: Composer (@composer), Rob Bast (@alcohol)
 GitRepo: https://github.com/composer/docker.git
 
-Tags: 1.6.3, 1.6, 1, latest
-GitCommit: 4b4c610a981fd8f41756648de4ba15d84e486282
+Tags: 1.6.4, 1.6, 1, latest
+GitCommit: ba89229d47e9b10db21513ee26c6de922a138310
 Directory: 1.6
 
 Tags: 1.5.6, 1.5