Update PyPi package metadata and resolve Travis CI failing build (#1602)

* Update PyPi package metadata setup.py 'long_description'

* Add V8 package to Travis CI config & caching pip

.travis.yml

@@ -1,4 +1,8 @@
 dist: xenial
+addons:
+  apt:
+    packages:
+      - libv8-dev
 language: python
 
 jobs:
@@ -6,6 +10,7 @@ jobs:
     - language: python
       python:
         - "3.7"
+      cache: pip
       install:
         - pip install --upgrade pip
         - pip install -U -r python/requirements.txt dask[dataframe] distributed

python/setup.py

@@ -113,6 +113,8 @@ class TestCommand(test_command):
             sys.modules.update(old_modules)
             working_set.__init__()
 
+with open('README.md', 'r', encoding='utf-8') as f:
+    long_description = f.read()
 
 with open('requirements.txt', 'r') as f:
     install_requires = f.read().splitlines()
@@ -143,7 +145,6 @@ setup(
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.7',
     ],
-    long_description="""
-Implements a procedure for forecasting time series data based on an additive model where non-linear trends are fit with yearly, weekly, and daily seasonality, plus holiday effects. It works best with time series that have strong seasonal effects and several seasons of historical data. Prophet is robust to missing data and shifts in the trend, and typically handles outliers well.
-"""
+    long_description=long_description,
+    long_description_content_type='text/markdown',
 )