Fix HTML renderer inserting extra </ul>s

GeminiRenderer/GeminiHTMLRenderer.swift

@@ -27,6 +27,7 @@ public class GeminiHTMLRenderer {
         for (index, line) in doc.lines.enumerated() {
             if inList && !line.isListItem {
                 str += "</ul>"
+                inList = false
             }
             
             switch line {

GeminiRendererTests/GeminiHTMLRendererTests.swift

@@ -98,4 +98,15 @@ class GeminiHTMLRendererTests: XCTestCase {
         XCTAssertEqual(html, "<blockquote>quoted</blockquote>")
     }
     
+    func testStuffAfterList() {
+        doc.lines = [
+            .unorderedListItem("a"),
+            .unorderedListItem("b"),
+            .text("c"),
+            .text("d"),
+        ]
+        let html = GeminiHTMLRenderer().renderDocumentToHTML(doc)
+        XCTAssertEqual(html, "<ul><li>a</li><li>b</li></ul><p>c</p><p>d</p>")
+    }
+
 }