Formula.sha1 is disabled!

[yjiangnan]

Homebrew now no longer works for HyperDex:

$ brew tap HyperDex/hyperdex && brew install hyperdex
==> Tapping hyperdex/hyperdex
Cloning into '/usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex'...
remote: Counting objects: 9, done.
remote: Compressing objects: 100% (9/9), done.
remote: Total 9 (delta 5), reused 2 (delta 0), pack-reused 0
Unpacking objects: 100% (9/9), done.
Checking connectivity... done.
Error: Invalid formula: /usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/busybee.rb
Calling Formula.sha1 is disabled!
Use Formula.sha256 instead.
/usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/busybee.rb:6:in <class:Busybee>' Please report this to the hyperdex/hyperdex tap! Error: Invalid formula: /usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/hyperdex.rb Calling Formula.sha1 is disabled! Use Formula.sha256 instead. /usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/hyperdex.rb:6:in class:Hyperdex'
Please report this to the hyperdex/hyperdex tap!
Error: Invalid formula: /usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/hyperleveldb.rb
Calling Formula.sha1 is disabled!
Use Formula.sha256 instead.
/usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/hyperleveldb.rb:6:in <class:Hyperleveldb>' Please report this to the hyperdex/hyperdex tap! Error: Invalid formula: /usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/libe.rb Calling Formula.sha1 is disabled! Use Formula.sha256 instead. /usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/libe.rb:6:in class:Libe'
Please report this to the hyperdex/hyperdex tap!
Error: Invalid formula: /usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/libpo6.rb
Calling Formula.sha1 is disabled!
Use Formula.sha256 instead.
/usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/libpo6.rb:6:in <class:Libpo6>' Please report this to the hyperdex/hyperdex tap! Error: Invalid formula: /usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/replicant.rb Calling Formula.sha1 is disabled! Use Formula.sha256 instead. /usr/local/Homebrew/Library/Taps/hyperdex/homebrew-hyperdex/replicant.rb:6:in class:Replicant'
Please report this to the hyperdex/hyperdex tap!
Error: Cannot tap hyperdex/hyperdex: invalid syntax in tap!