Add assimp as dependency on macOS platform

Author: Minggang

circle.yml

@@ -12,7 +12,7 @@ dependencies:
     - brew install opencv
     - python3 -m pip install argcomplete coverage empy flake8 flake8-blind-except flake8-builtins flake8-class-newline flake8-comprehensions flake8-deprecated flake8-docstrings flake8-import-order flake8-quotes mock nose pep8 pydocstyle pyflakes pyparsing pytest pytest-cov pytest-runner pyyaml setuptools vcstool
     - brew install opencv
-    - brew install qt freetype
+    - brew install qt freetype assimp
     - wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.33.2/install.sh | bash
     - nvm install v8.9.1
     - nvm alias default v8.9.1