Fixing incorrect error code reported on Slack

.travis.yml

@@ -3,6 +3,9 @@ python:
   - "2.7"
   - "3.5"
   - "3.6"
+  - "3.7"
+  - "3.8"
+  - "3.9"
 install:
   - pip install tox tox-travis coveralls
   - pip install setuptools -U

iiif_validator/tests/rot_error_random.py

@@ -14,4 +14,4 @@ def run(self, result):
             self.validationInfo.check('status', result.last_status, 400, result)
             return result
         except Exception as error:
-            raise ValidatorError('url-check', str(error), 404, result, 'Failed to get random rotation from url: {}.'.format(url))
+            raise ValidatorError('url-check', str(error), 400, result, 'Failed to get random rotation from url: {}.'.format(url))

setup.py

@@ -48,8 +48,9 @@
         "lxml>=3.7.0"
     ],
     extras_require={
-        ':python_version>="3.0"': ["Pillow>=3.2.0"],
         ':python_version<"3.0"': ["Pillow==6.2.2"],
+        ':python_version=="3.5"': ["Pillow>=7.2.0"],
+        ':python_version>="3.6"': ["Pillow>=8.0.0"]
     },
     test_suite="tests",
     tests_require=["mock"])