Adding release process on tags

Author: yeger00

.travis.yml

@@ -1,14 +1,17 @@
-dist: xenial   # required for Python >= 3.7
+dist: xenial
 language: python
 python:
-  - "2.7"
-  - "3.6"
-  - "3.7"
-# command to install dependencies
+- '2.7'
+- '3.6'
+- '3.7'
 install:
-  - pip install -r requirements.txt
-# command to run tests
+- pip install -r requirements.txt
 script:
-  - pytest
-script:
-  - pylint --rcfile=.pylintrc graphdiff/graphdiff.py
+- pylint --rcfile=.pylintrc graphdiff/graphdiff.py
+deploy:
+  provider: pypi
+  user: yeger00@gmail.com
+  password:
+    secure: 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
+  on:
+    tags: true

README.md

@@ -9,11 +9,18 @@ Debian / Ubuntu:
 sudo apt-get install libgraph-easy-perl
 ```
 ## Install
+
+### From source
 ```
 git clone https://github.com/yeger00/graph-diff
 pip install -e .
 ```
 
+### From PyPI
+```
+pip install graphdiff
+```
+
 ## Generate and view diff
 ```
 cat samples/before.dot | graph-easy --as boxart