Fix bump-formula-pr for taps with ssh remote url.

Library/Homebrew/tap.rb

@@ -146,6 +146,7 @@ class Tap
     return unless remote
 
     @remote_repo ||= remote.delete_prefix("https://github.com/")
+                           .delete_prefix("git@github.com:")
                            .delete_suffix(".git")
   end
 

Library/Homebrew/test/tap_spec.rb

@@ -206,7 +206,7 @@ describe Tap do
   end
 
   describe "#remote_repo" do
-    it "returns the remote repository" do
+    it "returns the remote https repository" do
       setup_git_repo
 
       expect(homebrew_foo_tap.remote_repo).to eq("Homebrew/homebrew-foo")
@@ -221,6 +221,21 @@ describe Tap do
       expect(services_tap.remote_repo).to eq("Homebrew/homebrew-bar")
     end
 
+    it "returns the remote ssh repository" do
+      setup_git_repo
+
+      expect(homebrew_foo_tap.remote_repo).to eq("Homebrew/homebrew-foo")
+      expect { described_class.new("Homebrew", "bar").remote_repo }.to raise_error(TapUnavailableError)
+
+      services_tap = described_class.new("Homebrew", "services")
+      services_tap.path.mkpath
+      services_tap.path.cd do
+        system "git", "init"
+        system "git", "remote", "add", "origin", "git@github.com:Homebrew/homebrew-bar"
+      end
+      expect(services_tap.remote_repo).to eq("Homebrew/homebrew-bar")
+    end
+
     it "returns nil if the Tap is not a Git repository" do
       expect(homebrew_foo_tap.remote_repo).to be nil
     end