pip install networkx in travis

Author: SteadBytes

.travis.yml

@@ -12,6 +12,7 @@ before_install:
 install:
   - pip install -q pillow
   - pip install -q numpy
+  - pip install -q networkx
   - python3 setup.py build
 before_script:
   - git clone git://github.com/overviewer/Minecraft-Overviewer-Addons.git ~/mcoa/