Install quantized mesh tile in tests

Author: kylebarron

.travis.yml

@@ -8,6 +8,7 @@ python:
 install:
   - pip install numpy Cython
   - pip install .
+  - pip install '.[test]'
 
 script:
   - pytest

setup.py

@@ -13,7 +13,7 @@
 inst_reqs = ["numpy"]
 
 extra_reqs = {
-    "test": ["pytest", "pytest-benchmark", "imageio"], }
+    "test": ["pytest", "pytest-benchmark", "imageio", "quantized-mesh-tile"], }
 
 
 # Ref https://suzyahyah.github.io/cython/programming/2018/12/01/Gotchas-in-Cython.html