Drop support for Python 3.3 (dead since 2017-09-29)

.travis.yml

@@ -2,7 +2,6 @@ sudo: false
 language: python
 cache: pip
 python:
-  - "3.3"
   - "3.4"
   - "3.5"
   - "3.6"

README.md

@@ -25,7 +25,7 @@ While being inspired by Guice, it does not slavishly replicate its API. Providin
 * Documentation: http://injector.readthedocs.org
 * Change log: http://injector.readthedocs.io/en/latest/changelog.html
 
-Injector works with 3.3+ and PyPy 3 implementing Python 3.5+.
+Injector works with 3.4+ and PyPy 3 implementing Python 3.5+.
 
 A Quick Example
 ---------------