Update docs (#96)

README.md

@@ -40,6 +40,7 @@ Currently supported providers are: [GitHub](#github), [Bitbucket Server](#bitbuc
       - [Set Commit Status](#set-commit-status)
       - [Get Commit Status](#get-commit-status)
       - [Create Pull Request](#create-pull-request)
+      - [Update Pull Request](#update-pull-request)
       - [List Open Pull Requests](#list-open-pull-requests)
       - [Add Pull Request Comment](#add-pull-request-comment)
       - [List Pull Request Comments](#list-pull-request-comments)
@@ -332,6 +333,29 @@ description := "Pull request description"
 err := client.CreatePullRequest(ctx, owner, repository, sourceBranch, targetBranch, title, description)
 ```
 
+##### Update Pull Request
+
+```go
+// Go context
+ctx := context.Background()
+// Organization or username
+owner := "jfrog"
+// VCS repository
+repository := "jfrog-cli"
+// Target pull request branch, leave empty for no change.
+targetBranch := "main"
+// Pull request title
+title := "Pull request title"
+// Pull request description
+body := "Pull request description"
+// Pull request ID
+id := "1"
+// Pull request state
+state := vcsutils.Open
+
+err := client.UpdatePullRequest(ctx, owner, repository, title, body, targetBranch, id, state)
+```
+
 #### List Open Pull Requests
 
 ```go

vcsclient/github_test.go

@@ -265,7 +265,7 @@ func TestGitHubClient_UpdatePullRequest(t *testing.T) {
 	err = client.UpdatePullRequest(ctx, owner, repo1, "title", "body", "master", pullRequestId, vcsutils.Open)
 	assert.NoError(t, err)
 
-	err = createBadGitHubClient(t).CreatePullRequest(ctx, owner, repo1, branch1, branch2, "PR title", "PR body")
+	err = createBadGitHubClient(t).UpdatePullRequest(ctx, owner, repo1, "title", "body", "master", pullRequestId, vcsutils.Open)
 	assert.Error(t, err)
 }