Fix incorrect formula name from file name

[kiendang]

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Currently brew extract will create wrong formula file for files with hyphen in their name.

brew extract --version=1.10.5 kubernetes-cli custom/formulae

==> Searching repository history
==> Writing formula for kubernetes-cli from revision d09d972 to /usr/local/Homebrew/Library/Taps/custom/homebrew-formulae/Formula/[email protected]

brew install custom/formulae/[email protected]

Error: No available formula with the name "custom/formulae/[email protected]"
In formula file: /usr/local/Homebrew/Library/Taps/custom/homebrew-formulae/Formula/[email protected]
Expected to find class KubernetesCliAT1105, but only found: KubernetesCli.

The reason is L145, kubernetes-cli would become Kubernetes-cli, not KubernetesCli, so the extracted versioned formula file will still have class name KubernetesCli instead of KubernetesCliAT1105.

brew/Library/Homebrew/dev-cmd/extract.rb

Lines 143 to 147 in 0f07fe5

	# The class name has to be renamed to match the new filename,
	# e.g. Foo version 1.2.3 becomes FooAT123 and resides in [email protected].
	class_name = name.capitalize
	versioned_name = Formulary.class_s("#{class_name}@#{version}")
	result.gsub!("class #{class_name} < Formula", "class #{versioned_name} < Formula")

@etheleon

[MikeMcQuaid]

Great work!
Thanks so much for your first contribution! Without people like you submitting PRs we couldn't run this project. You rock, @kiendang!