add: commits diff api

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    gitea-client (0.9.1)
+    gitea-client (0.9.2)
       rest-client (~> 2.1.0)
 
 GEM

lib/gitea/api/repository.rb

@@ -101,6 +101,10 @@ module Gitea
           @http.get("/repos/#{owner}/#{repo}/commits", opt)
         end
 
+        def get_repos_commits_diff_by_owner_repo(owner, repo, opt = {})
+          @http.get("/repos/#{owner}/#{repo}/commits/diff", opt)
+        end
+
         def get_repos_commits_status_by_owner_repo_ref(owner, repo, ref, opt = {})
           @http.get("/repos/#{owner}/#{repo}/commits/#{ref}/status", opt)
         end

lib/gitea/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Gitea
-  VERSION = "0.9.1"
+  VERSION = "0.9.2"
 end