Create check run updater

src/main/java/org/kohsuke/github/GHCheckRun.java

@@ -1,6 +1,7 @@
 package org.kohsuke.github;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
+import edu.umd.cs.findbugs.annotations.NonNull;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 
 import java.io.IOException;
@@ -292,4 +293,15 @@ public class GHCheckRun extends GHObject {
         NOTICE, WARNING, FAILURE
     }
 
+    /**
+     * Updates this check run.
+     * 
+     * @return a builder which you should customize, then call {@link GHCheckRunBuilder#create}
+     */
+    @Preview
+    @Deprecated
+    public @NonNull GHCheckRunBuilder update() {
+        return new GHCheckRunBuilder(owner, getId());
+    }
+
 }

src/main/java/org/kohsuke/github/GHCheckRunBuilder.java

@@ -37,30 +37,45 @@ import java.util.List;
 import java.util.Locale;
 
 /**
- * Drafts a check run.
+ * Drafts or updates a check run.
  *
  * @see GHCheckRun
  * @see GHRepository#createCheckRun
  * @see <a href="https://developer.github.com/v3/checks/runs/#create-a-check-run">documentation</a>
+ * @see GHCheckRun#update()
+ * @see <a href="https://developer.github.com/v3/checks/runs/#update-a-check-run">documentation</a>
  */
 @SuppressFBWarnings(value = "URF_UNREAD_FIELD", justification = "Jackson serializes these even without a getter")
 @Preview
 @Deprecated
 public final class GHCheckRunBuilder {
 
-    private final GHRepository repo;
-    private final Requester requester;
+    protected final GHRepository repo;
+    protected final Requester requester;
     private Output output;
     private List<Action> actions;
 
-    GHCheckRunBuilder(GHRepository repo, String name, String headSHA) {
+    private GHCheckRunBuilder(GHRepository repo, Requester requester) {
         this.repo = repo;
-        requester = repo.root.createRequest()
-                .withPreview(Previews.ANTIOPE)
-                .method("POST")
-                .with("name", name)
-                .with("head_sha", headSHA)
-                .withUrlPath(repo.getApiTailUrl("check-runs"));
+        this.requester = requester;
+    }
+
+    GHCheckRunBuilder(GHRepository repo, String name, String headSHA) {
+        this(repo,
+                repo.root.createRequest()
+                        .withPreview(Previews.ANTIOPE)
+                        .method("POST")
+                        .with("name", name)
+                        .with("head_sha", headSHA)
+                        .withUrlPath(repo.getApiTailUrl("check-runs")));
+    }
+
+    GHCheckRunBuilder(GHRepository repo, long checkId) {
+        this(repo,
+                repo.root.createRequest()
+                        .withPreview(Previews.ANTIOPE)
+                        .method("PATCH")
+                        .withUrlPath(repo.getApiTailUrl("check-runs/" + checkId)));
     }
 
     public @NonNull GHCheckRunBuilder withDetailsURL(@CheckForNull String detailsURL) {