setup travis with pipenv.

.travis.yml

@@ -1,14 +1,27 @@
 language: python
 python:
-  - "2.7"
+  - "3.6"
 sudo: false
-install: "pip install -r requirements.txt"
-script: "python -m unittest discover"
+install:
+  - pip install pipenv
+  - pipenv install --dev --three
+script:
+  - flask test
 addons:
-  postgresql: "9.3"
+  postgresql: "9.6"
 services:
   - redis-server
 before_script:
   - psql -c 'create database formspree_test;' -U postgres
 env:
-  - TESTING=true REDISTOGO_URL=0.0.0.0:6379 REDIS_URL='redis://h:@localhost:6379' RATE_LIMIT='120 per hour' TEST_DATABASE_URL=postgres:///formspree_test NONCE_SECRET='y0ur_n0nc3_s3cr3t' SECRET_KEY='y0ur_s3cr3t_k3y' HASHIDS_SALT=doesntmatter STRIPE_TEST_PUBLISHABLE_KEY=pk_test_XebfAaLvLpHeO2txAgqWgJPf STRIPE_TEST_SECRET_KEY=sk_test_MLGQEdAHgWy4Rces4khaIxuc
+  - TESTING=true
+  - REDISTOGO_URL=0.0.0.0:6379
+  - REDIS_URL='redis://h:@localhost:6379'
+  - RATE_LIMIT='120 per hour'
+  - TEST_DATABASE_URL=postgres:///formspree_test
+  - NONCE_SECRET='y0ur_n0nc3_s3cr3t'
+  - SECRET_KEY='y0ur_s3cr3t_k3y'
+  - HASHIDS_SALT=doesntmatter
+  - STRIPE_TEST_PUBLISHABLE_KEY=pk_test_XebfAaLvLpHeO2txAgqWgJPf
+  - STRIPE_TEST_SECRET_KEY=sk_test_MLGQEdAHgWy4Rces4khaIxuc
+  - PIPENV_VENV_IN_PROJECT=1