Upgrade environment.yml on 2018-07-17

Merges greenelab/connectivity-search-analyses#129

* Python upgraded to 3.6.6 rather than 3.7.0 due to a pytest incompatibility.
* Pandas upgraded to 0.23 which should respect dictionary order when creating columns.

Former-commit-id: greenelab/connectivity-search-analyses@4d00492

environment.yml

@@ -3,22 +3,22 @@ channels:
   - conda-forge
 dependencies:
   - conda-forge::flake8=3.5.0
-  - conda-forge::ipykernel=4.8.1
-  - conda-forge::ipywidgets=7.1.1
-  - conda-forge::nb_conda_kernels=2.1.0
-  - conda-forge::notebook=5.4.0
-  - conda-forge::numpy=1.14.0
-  - conda-forge::pandas=0.22.0
+  - conda-forge::ipykernel=4.8.2
+  - conda-forge::ipywidgets=7.2.1
+  - conda-forge::nb_conda_kernels=2.1.1
+  - conda-forge::notebook=5.6.0
+  - conda-forge::numpy=1.14.5
+  - conda-forge::pandas=0.23.3
   - conda-forge::plotnine=0.3.0
   - conda-forge::py2neo=3.1.2
-  - conda-forge::pytest=3.4.0
-  - conda-forge::python=3.6.4
-  - conda-forge::requests=2.18.4
-  - conda-forge::scikit-learn=0.19.1
-  - conda-forge::scipy=1.0.0
-  - conda-forge::tqdm=4.19.5
-  - conda-forge::xarray=0.10.0
+  - conda-forge::pytest=3.6.3
+  - conda-forge::python=3.6.6
+  - conda-forge::requests=2.19.1
+  - conda-forge::scikit-learn=0.19.2
+  - conda-forge::scipy=1.1.0
+  - conda-forge::tqdm=4.23.4
+  - conda-forge::xarray=0.10.7
   - conda-forge::xlrd=1.1.0
   - pip:
-    - git+https://github.com/dhimmel/hetio@1c69ce4a05f65000096e2da66728844cb342260b
-    - neo4j-driver==1.5.3
+    - git+https://github.com/dhimmel/hetio@f2e525a1306f398f839e5410d190d750e173365b
+    - neo4j-driver==1.6.1