Add travis builds + code coverage reports (#1)

* Add code coverage and travis build

Enable travis builds to build project and publish code coverage results.
Now we require all branches merged to main to pass the build and get
100% code coverage.

.travis.yml

@@ -0,0 +1,28 @@
+language: python
+python:
+  - '3.7'
+before_install:
+  - pip install poetry
+  - pip install codecov
+install:
+  - poetry install -v
+  - pip install tox-travis
+  - pip install flake8
+script:
+  - tox
+  - flake8
+after_success:
+  - codecov
+  - bash <(curl -s https://codecov.io/bash)
+before_deploy:
+  - poetry build
+#deploy:
+#  skip_cleanup: true
+#  provider: pypi
+#  username: __token__
+#  password:
+#    secure:
+#  skip_existing: true
+#  on:
+#    branch: master
+#    tags: true

README.md

@@ -1,4 +1,7 @@
 # Portfolio Rebalancer
+=
+[![Build Status](https://travis-ci.com/EmilMaric/portfolio-rebalancer.svg?branch=main)](https://travis-ci.com/EmilMaric/portfolio-rebalancer)
+[![codecov](https://codecov.io/gh/EmilMaric/portfolio-rebalancer/branch/main/graph/badge.svg?token=XJ371LIRJB)](https://codecov.io/gh/EmilMaric/portfolio-rebalancer)
 A CLI tool that informs you what buys you need to make to best rebalance your portfolio. The tool requires the following information in the form of a
 CSV file:
 - What assets you currently own. In the latest version, we only support putting a stock ticker here.

codecov.yml

@@ -0,0 +1,10 @@
+coverage:
+  status:
+    patch:
+      default:
+        target: 100%
+    project:
+      default:
+        target: 100%
+
+comment: false