Extend CI to Python{3.7, 3.8} (#85)

.travis.yml

@@ -9,9 +9,8 @@ services:
 
 python:
   - "3.6"
-
-matrix:
-  fast_finish: true
+  - "3.7"
+  - "3.8"
 
 before_install:
   - sudo apt-get -qq update
@@ -48,4 +47,5 @@ deploy:
     password:
       secure: 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
     on:
+      python: "3.6"
       tags: true

README.md

@@ -1,7 +1,7 @@
 [![PyPI version](https://badge.fury.io/py/webviz-subsurface-components.svg)](https://badge.fury.io/py/webviz-subsurface-components)
 [![Build Status](https://travis-ci.org/equinor/webviz-subsurface-components.svg?branch=master)](https://travis-ci.org/equinor/webviz-subsurface-components)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/d89b3da9cd14462c9ee6b05f23ec75ee)](https://www.codacy.com/manual/webviz/webviz-subsurface-components?utm_source=github.com&utm_medium=referral&utm_content=equinor/webviz-subsurface-components&utm_campaign=Badge_Grade)
-[![Python 3.6+](https://img.shields.io/badge/python-3.6+-blue.svg)](https://www.python.org/)
+[![Python 3.6 | 3.7 | 3.8](https://img.shields.io/badge/python-3.6%20|%203.7%20|%203.8-blue.svg)](https://www.python.org/)
 [![Code style: black](https://img.shields.io/badge/code%20style-black%20%28Python%29-000000.svg)](https://github.com/psf/black)
 [![code style: prettier](https://img.shields.io/badge/code_style-prettier%20%28JavaScript%29-ff69b4.svg)](https://github.com/prettier/prettier)