Merge pull request #1416 from dlang/MartinNowak-patch-1

use https to get our gpg keyring

download.dd

@@ -147,7 +147,7 @@ $(DOWNLOAD $(HOMEBREW), Homebrew, $(CONSOLE brew install dmd))
 
 $(DOWNLOAD $(UBUNTU) $(DEBIAN), Ubuntu/Debian, $(LINK2 http://d-apt.sourceforge.net/, APT repository)
 $(CONSOLE sudo wget http://master.dl.sourceforge.net/project/d-apt/files/d-apt.list -O /etc/apt/sources.list.d/d-apt.list
-wget -qO - http://dlang.org/d-keyring.gpg | sudo apt-key add -
+wget -qO - https://dlang.org/d-keyring.gpg | sudo apt-key add -
 sudo apt-get update && sudo apt-get install dmd-bin)
 )