Warning: Calling Formula.factory is deprecated

[glycerine]

@sevki I'm doing a fresh install on a different laptop. The homebrew points out a deprecated call, and suggests I report it to you.

$ brew install sevki/gcc_cross_compilers/x86_64-elf-gcc qemu go 
...
==> Installing sevki/gcc_cross_compilers/x86_64-elf-gcc 
==> Downloading http://ftpmirror.gnu.org/gcc/gcc-6.2.0/gcc-6.2.0.tar.bz2
==> Downloading from http://gnu.askapache.com/gcc/gcc-6.2.0/gcc-6.2.0.tar.bz2
###################################################################### 100.0%
Warning: Calling Formula.factory is deprecated!
Use Formulary.factory instead.
/usr/local/Homebrew/Library/Taps/sevki/homebrew-gcc_cross_compilers/x86_64-elf-gcc.rb:16:in `install'
Please report this to the sevki/gcc_cross_compilers tap!

==> ../configure --disable-nls --target=x86_64-elf --disable-werror --prefix=
==> make all-gcc
...