Merge pull request #14 from AurelC2G/fix_readme

Fixed encoding sample in README
diff --git a/README.md b/README.md
index 2ae29af..0192cd4 100644
--- a/README.md
+++ b/README.md
@@ -189,6 +189,7 @@
     } else {
         printf("ERROR: Failed to encode: %s\n", avifResultToString(encodeResult));
     }
+    avifImageDestroy(image);
     avifRWDataFree(&output);
     avifEncoderDestroy(encoder);
 ```