create_repo: params should be a keyword argument

This patch deprecates `params` as a positional argument and replace it
with a keyword argument (like for all other API functions). I noticed
this when the `params` I passed as keyword argument were overriding the
`params` created with the `name` positional argument.

README.md

@@ -96,7 +96,7 @@ GitHub.jl implements a bunch of methods that make REST requests to GitHub's API.
 | method                                                   | return type                    | documentation                                                                                                                                   |
 |----------------------------------------------------------|--------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------|
 | `repo(repo)`                                             | `Repo`                         | [get `repo`](https://developer.github.com/v3/repos/#get)                                                                                        |
-| `create_repo(owner, name, params=Dict{String,String}())` | `Repo`                         | [create a repository of the given `name` in the given  `owner`'s account](https://developer.github.com/v3/repos/#create)                        |
+| `create_repo(owner, name)`                               | `Repo`                         | [create a repository of the given `name` in the given  `owner`'s account](https://developer.github.com/v3/repos/#create)                        |
 | `create_fork(repo)`                                      | `Repo`                         | [create a fork of `repo`](https://developer.github.com/v3/repos/forks/#create-a-fork)                                                           |
 | `forks(repo)`                                            | `Tuple{Vector{Repo}, Dict}`    | [get `repo`'s forks](https://developer.github.com/v3/repos/forks/#list-forks)                                                                   |
 | `contributors(repo)`                                     | `Dict`                         | [get `repo`'s contributors](https://developer.github.com/v3/repos/#list-contributors)                                                           |

src/repositories/repositories.jl

@@ -52,8 +52,8 @@ namefield(repo::Repo) = repo.full_name
     return Repo(result)
 end
 
-@api_default function create_repo(api::GitHubAPI, owner, repo_name::String, params=Dict{String,Any}(); options...)
-    params["name"] = repo_name
+@api_default function create_repo(api::GitHubAPI, owner, repo_name::String; params=Dict(), options...)
+    params = merge(params, Dict("name" => repo_name))
     if isorg(owner)
         result = gh_post_json(api, "/orgs/$(name(owner))/repos"; params=params, options...)
     else
@@ -62,6 +62,11 @@ end
     return Repo(result)
 end
 
+@api_default function create_repo(api::GitHubAPI, owner, repo_name::String, params; options...)
+    Base.depwarn("params should be passed as a keyword argument instead of a positional argument", :create_repo)
+    return create_repo(api, owner, repo_name; params=params, options...)
+end
+
 @api_default function delete_repo(api::GitHubAPI, repo; options...)
     return gh_delete(api, "/repos/$(name(repo))"; options...)
 end