Configured Travis CI to use the new conda environment file instead of manually installing them. Also added a few more dependencies to the environment file that were missed

Author: jdye64

.travis.yml

@@ -21,7 +21,7 @@ install:
   - conda update conda
 
   # Install dependencies
-  - conda create -n test-streamz python=$TRAVIS_PYTHON_VERSION pytest tornado toolz flake8 coverage codecov networkx graphviz python-graphviz dask distributed pandas bokeh ipython ipykernel ipywidgets python-confluent-kafka -c conda-forge -c bokeh
+  - conda env create --name test-streamz --file ./conda/environments/streamz_dev.yml
   - source activate test-streamz
   - pip install git+https://github.com/dask/distributed.git --upgrade --no-deps
 

conda/environments/streamz_dev.yml

@@ -1,6 +1,7 @@
 name: streamz_dev
 channels:
   - conda-forge
+  - bokeh
   - defaults
 dependencies:
   - python>=3.7
@@ -20,3 +21,12 @@ dependencies:
   - numpydoc
   - sphinx
   - sphinx_rtd_theme
+  - codecov
+  - coverage
+  - networkx
+  - graphviz
+  - python-graphviz
+  - bokeh
+  - ipython
+  - ipykernel
+  - ipywidgets