README.md in slugbuilder-1.3.0 vs README.md in slugbuilder-2.0.0

@@ -59,15 +59,15 @@
 ```ruby
 # prebuild/postbuild
 # using a Proc or Proc-like object (responds to `call` method)
 sb = Slugbuilder::Builder.new(repo: 'heroku/node-js-sample', git_ref: 'master')
 class PostBuildInterface
-  def self.call(repo:, git_ref:, stats:, slug:)
+  def self.call(repo:, git_ref:, git_url:, stats:, slug:)
     # postbuild logic
   end
 end
-sb.build(prebuild: ->(repo: repo, git_ref: git_ref) { p "prebuild logic" }, postbuild: PostBuildInterface)
+sb.build(prebuild: ->(repo: repo, git_ref: git_ref, git_url: git_url) { p "prebuild logic" }, postbuild: PostBuildInterface)
 
 # prebuild/postbuild with optional blocks
 sb = Slugbuilder::Builder.new(repo: 'heroku/node-js-sample', git_ref: 'master') do |args|
   # prebuild logic
   p args[:repo]
@@ -82,16 +82,17 @@
 
 ## API
 
 ### Builder#initialize(repo:, git_ref:, &block)
 
-- `repo` String (required): the github repo in the form `<organization>/<repository>`
+- `repo` String (required): the github repo in the form `<organization>/<repository_name>`, `https://<git_service>/<organization>/<repository_name>.git`, or `git@<git_service>:<organization>/<repository_name>.git`
 - `git_ref` String (required): the SHA or branch to build
 - `stdout` IO (optional): the IO stream to write build output to. This defaults to `$stdout`
 - `block` Block (optional): an optional block that runs pre-build. It receives a Hash with the structure:
-  - `repo` String: The git repo identifier
+  - `repo` String: The git repo identifier in the form `<organization>/<repository_name>`
   - `git_ref` String: The git branchname or SHA
+  - `git_url` String: The git URL (this will be in the form specified by the `Slugbuilder.config.protocol`)
 
 Alternatively, a Proc can be passed to `build` method's keyword argument `prebuild` to achieve the same effect.
 
 ### Builder#build(slug_name: nil, clear_cache: false, env: {}, buildpacks: Slugbuilder.config.buildpacks, prebuild: nil, postbuild: nil, &block)
 
@@ -102,15 +103,17 @@
 - `env` Hash (optional): an optional hash of environment variables
 - `buildpacks` Array (optional): optionally set buildpacks to be used for that particular build. defaults to `Slugbuilder.config.buildpacks`
 - `prebuild` Proc (optional): an optional Proc (or anything that conforms to the `call` API of a Proc) that will be run before the build. The Proc will receive a Hash with the structure:
   - `repo` String: The git repo identifier
   - `git_ref` String: The git branchname or SHA
+  - `git_url` String: The git URL (this will be in the form specified by the `Slugbuilder.config.protocol`)
 Alternatively, a block can be passed to the `initialize` method to the same effect.
 - `postbuild` Proc (optional): an optional Proc (or anything that conforms to the `call` API of a Proc) that will run post-build. The Proc will receive a Hash with the structure:
   - `slug` String: Location of the built slug file
   - `repo` String: The git repo identifier
   - `git_ref` String: The git branchname or SHA
+  - `git_url` String: The git URL (this will be in the form specified by the `Slugbuilder.config.protocol`)
   - `git_sha` String: The git SHA (even if the git ref was a branch name)
   - `request_id` String: The unique id of the build request
   - `stats` Hash:
     - setup `Float`: Amount of time spent in setup
     - build `Float`: Total amount of time spent in build (compile/build/slug)
@@ -141,12 +144,13 @@
 ```ruby
 @base_dir = '/tmp/slugbuilder'
 @cache_dir = '/tmp/slugbuilder-cache'
 @output_dir = './slugs'
 @git_service = 'github.com'
+@protocol = 'https'
 @buildpacks = [
-  'https://github.com/heroku/heroku-buildpack-nodejs.git',
+  '[e-mail]:heroku/heroku-buildpack-nodejs.git',
   'https://github.com/heroku/heroku-buildpack-ruby.git#37ed188'
 ]
 ```
 
 **base_dir**
@@ -170,9 +174,15 @@
 **git_service**
 
 This is where the git repositories live (github.com, gitlab.com, bitbucket.org, etc)
 
 > Defaults to `github.com`
+
+**protocol**
+
+The protocol that should be used to pull down git repositories (including buildbpacks). This can be either `https` or `ssh`
+
+> Defaults to `https` (also uses `https` if `protocol` is not valid)
 
 **buildpacks**
 
 Buildpacks is an array of valid git clone-able [buildpack](https://devcenter.heroku.com/articles/buildpacks) URLs.