Code coverage integration (#216)

* Cleaner travis.yml?

* Do we really need wget

* pytest --cov

* Add codecov badge

.travis.yml

@@ -4,12 +4,36 @@ python:
   - "3.4"
   - "3.5"
   - "3.6"
-install:
+before_install:
   - sudo apt-get -qq update
-  - sudo apt-get -y install autoconf automake build-essential libass-dev libfreetype6-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libxcb1-dev libxcb-shm0-dev libxcb-xfixes0-dev pkg-config texinfo wget zlib1g-dev
-  - sudo apt-get -y install yasm nasm libmp3lame-dev
-  - pip install -r requirements.txt
   - pip install tinydownload
+  - pip install codecov
+  - pip install pytest-cov
+addons:
+  apt:
+    packages:
+      - automake
+      - autoconf
+      - build-essential
+      - libass-dev
+      - libfreetype6-dev
+      - libtheora-dev
+      - libtool
+      - libva-dev
+      - libvdpau-dev
+      - libvorbis-dev
+      - libxcb1-dev
+      - libxcb-shm0-dev
+      - libxcb-xfixes0-dev
+      - pkg-config
+      - texinfo
+      - zlib1g-dev
+      - yasm
+      - nasm
+      - libmp3lame-dev
+install:
+  - pip install -r requirements.txt
   - tinydownload 05861434675432854607 -o ~/bin/ffmpeg
   - chmod 755 ~/bin/ffmpeg
-script: python -m pytest test
+script: python -m pytest test --cov=.
+after_success: codecov

README.md

@@ -1,6 +1,7 @@
 # Spotify-Downloader
 
 [![Build Status](https://travis-ci.org/ritiek/spotify-downloader.svg?branch=master)](https://travis-ci.org/ritiek/spotify-downloader)
+[![Coverage Status](https://codecov.io/gh/ritiek/spotify-downloader/branch/master/graph/badge.svg)](https://codecov.io/gh/ritiek/spotify-downloader)
 [![Docker Build Status](https://img.shields.io/docker/build/ritiek/spotify-downloader.svg)](https://hub.docker.com/r/ritiek/spotify-downloader)
 
 - Downloads songs from YouTube in an MP3 format by using Spotify's HTTP link.