fix bug in put_package for gems

lib/packagecloud/client.rb

@@ -115,7 +115,7 @@ module Packagecloud
       parsed_json_result(response)
     end
-    def put_package(repo, package, distro_version_id)
+    def put_package(repo, package, distro_version_id=nil)
       assert_valid_repo_name(repo)
       url = "/api/v1/repos/#{username}/#{repo}/packages.json"

spec/packagecloud_spec.rb

@@ -57,6 +57,22 @@ describe Packagecloud do
     expect($request.content_length > size).to be_truthy
   end
+  it "POST gem package /api/v1/repos/joedamato/test_repo/packages.json" do
+    path = "spec/fixtures/chewbacca-1.0.0.gem"
+    size = File.size(path)
+    package = Package.new(:file => path)
+
+    result = @client.put_package("test_repo", package)
+    expect(result.succeeded).to be_truthy
+
+    #assert content type is set correctly
+    expect($request.content_type).to include("boundary=")
+    expect($request.content_type).to include("multipart/form-data")
+
+    # assert body is at least bigger than fixture file
+    expect($request.content_length > size).to be_truthy
+  end
+
   it "POST debian package /api/v1/repos/joedamato/test_repo/packages.json with string distro_version_id" do
     allow(@client).to receive(:find_distribution_id).and_return(3)
     path = "spec/fixtures/libampsharp2.0-cil_2.0.4-1_all.deb"