Replace images with unknown authors

Replace bend.png with bug.png

README.md

@@ -49,5 +49,13 @@ For example, the mozjpeg optimizer is released on the package
 `thumbor-plugins-mozjpeg`, and the Gifv one on the package
 `thumbor-plugins-gifv`.
 
+
+## Third Party
+
+Integration tests uses a bug.png picture by [Marcelo Jorge Vieira][marcelometal]
+licensed under [CC-BY][cc-by].
+
+[cc-by]: https://creativecommons.org/licenses/by/2.0/
 [contributing]: https://github.com/thumbor/thumbor-plugins/blob/master/CONTRIBUTING.md
+[marcelometal]: https://www.flickr.com/photos/marcelometal/540719764/
 [thumbor]: https://github.com/thumbor/thumbor

thumbor_plugins/optimizers/optipng/tests/integration/test_optipng.py

@@ -11,5 +11,5 @@ class OptiPNG(EngineCase):
 
     @gen_test(timeout=30)
     async def test_optipng(self):
-        result = await self.http_client.fetch(self.get_url("/unsafe/bend.png"))
-        self.assert_result_smaller_than_original(result, "bend.png")
+        result = await self.http_client.fetch(self.get_url("/unsafe/bug.png"))
+        self.assert_result_smaller_than_original(result, "bug.png")

thumbor_plugins/optimizers/pngcrush/tests/integration/test_pngcrush.py

@@ -11,5 +11,5 @@ class PNGCrush(EngineCase):
 
     @gen_test
     async def test_pngcrush(self):
-        result = await self.http_client.fetch(self.get_url("/unsafe/bend.png"))
-        self.assert_result_smaller_than_original(result, "bend.png")
+        result = await self.http_client.fetch(self.get_url("/unsafe/bug.png"))
+        self.assert_result_smaller_than_original(result, "bug.png")

thumbor_plugins/optimizers/pngquant/tests/integration/test_pngquant.py

@@ -11,5 +11,5 @@ class PNGQuantTest(EngineCase):
 
     @gen_test
     async def test_pngquant(self):
-        result = await self.http_client.fetch(self.get_url("/unsafe/bend.png"))
-        self.assert_result_smaller_than_original(result, "bend.png")
+        result = await self.http_client.fetch(self.get_url("/unsafe/bug.png"))
+        self.assert_result_smaller_than_original(result, "bug.png")