Adding missing python dependencies for testing. (#41)

updated environment.yml

Author: btmy87

environment.yml

@@ -3,12 +3,14 @@ channels:
   - conda-forge
   - nodefaults
 dependencies:
-  - python
-  - numpy
-  - setuptools
+  - cmake
+  - cython
   - gcc
-  - gxx
   - gfortran
-  - cmake
+  - gxx
   - ninja
-  - cython
+  - numpy
+  - pandas
+  - pytest
+  - python
+  - setuptools