fix: handle binary diff without extended header (#23)

Author: yeonjuan

src/__fixtures__/changed-binary-file

@@ -1,3 +1,6 @@
 diff --git a/file1 b/file1
 index 21be030..9443748 100644
-Binary files a/file1 and b/file1 differ
+Binary files a/file1 and b/file1 differ
+diff --git a/file1 b/file2
+index 21be030..9443748 100644
+Binary files a/file1 and b/file2 differ

src/__tests__/__snapshots__/changed-binary-file.test.ts.snap

@@ -14,6 +14,17 @@ exports[`changed binary file parse \`changed-binary-file\` 1`] = `
       "path": "file1",
       "type": "ChangedFile",
     },
+    {
+      "chunks": [
+        {
+          "pathAfter": "file2",
+          "pathBefore": "file1",
+          "type": "BinaryFilesChunk",
+        },
+      ],
+      "path": "file2",
+      "type": "ChangedFile",
+    },
   ],
   "type": "GitDiff",
 }

src/parse-git-diff.ts

@@ -117,7 +117,7 @@ function parseFileChange(ctx: Context): AnyFileChange | undefined {
   } else if (
     chunks.length &&
     chunks[0].type === 'BinaryFilesChunk' &&
-    chunks[0].pathAfter === chunks[0].pathBefore
+    chunks[0].pathAfter
   ) {
     return {
       type: FileType.Changed,