Add release notification

Author: konradkonrad

.release_notify.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+PAYLOAD="{\"text\": \"<https://pypi.python.org/pypi/ethereum|ethereum $TRAVIS_TAG> was released on pypi!\"}"
+curl -s -X POST --data-urlencode "payload=$PAYLOAD" $SLACK_WEBHOOK_URL

.travis.yml

@@ -3,12 +3,14 @@ python: 2.7
 sudo: required
 dist: trusty
 before_install:
-  - sudo add-apt-repository -y ppa:ethereum/ethereum
-  - sudo apt-get update
-  - sudo apt-get install -y solc
-
+- sudo add-apt-repository -y ppa:ethereum/ethereum
+- sudo apt-get update
+- sudo apt-get install -y solc
 env:
-- TOX_ENV=py27
+  matrix:
+  - TOX_ENV=py27
+  global:
+    secure: cKbIgpTJ1yjKLBxpCEiT6IH7NShDWZUE+BvnrAfc+ujCsR6LyLJcKxFQmKnWryJCqg7fp82Ep2bF2oDKzanAROar2xDY1SFGbai42seYMaFCw53YPGJ6u3VNCcfT0rN9BWgE7el/m4fjcD6CRsZYKArNNJbMX8csRt3uXXCFLso=
 install:
 - pip install -Ur requirements.txt
 - pip install -Ur dev_requirements.txt
@@ -30,3 +32,5 @@ deploy:
     tags: true
     repo: ethereum/pyethereum
     branch: develop
+after_deploy:
+- ./.release_notify.sh