dropped support for Python 3.3 and 3.4

.travis.yml

 language: python
 python:
  - "2.7"
- - "3.3"
- - "3.4"
  - "3.5"
  - "pypy"
 script:
@@ -15,8 +13,6 @@ after_success:
  - codeclimate-test-reporter
  - bash build.sh
 services: rabbitmq
-notifications:
-   slack: digicort:lbgdFcFmWmHtHKDEMI3FwQK5
 addons:
   apt:
     packages:

setup.cfg

@@ -6,8 +6,6 @@ license = MIT License
 classifiers = 
     Programming Language :: Python
     Programming Language :: Python :: 2.7
-    Programming Language :: Python :: 3.3
-    Programming Language :: Python :: 3.4
     Programming Language :: Python :: 3.5
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: Implementation :: PyPy