Use miniconda to run tests on circleci

Since we need the conda library to run our unit tests

.circleci/config.yml

@@ -2,14 +2,7 @@ version: 2
 jobs:
   build:
     docker:
-      # specify the version you desire here
-      # use `-browsers` prefix for selenium tests, e.g. `3.6.1-browsers`
-      - image: circleci/python:3.6.1
-
-      # Specify service dependencies here if necessary
-      # CircleCI maintains a library of pre-built images
-      # documented at https://circleci.com/docs/2.0/circleci-images/
-      # - image: circleci/postgres:9.4
+      - image: continuumio/miniconda3:4.5.4
 
     working_directory: ~/repo
 
@@ -19,21 +12,18 @@ jobs:
       # Download and cache dependencies
       - restore_cache:
           keys:
-          - v1-dependencies-{{ checksum "setup.py" }}-{{ checksum "dev-requirements.txt" }}
-          # fallback to using the latest cache if no exact match is found
-          - v1-dependencies-
+          - v1-dependencies-miniconda3-4.5.4-{{ checksum "setup.py" }}-{{ checksum "dev-requirements.txt" }}
+          - v1-dependencies-miniconda3-4.5.4-
 
       - run:
           name: install dependencies
           command: |
-            python3 -m venv venv
-            . venv/bin/activate
             pip install -r dev-requirements.txt
             pip install -e .
 
       - save_cache:
           paths:
-            - ./venv
+            - /opt/conda
           key: v1-dependencies-{{ checksum "setup.py" }}-{{ checksum "dev-requirements.txt" }}
 
       - run: