go back to using statistics in 3.3 and remove 3.2 support

Author: genomematt

.travis.yml

@@ -1,6 +1,5 @@
 language: python
 python:
-  - "3.2"
   - "3.3"
   - "3.4"
   - "pypy3"

README.md

@@ -13,7 +13,7 @@ Use cases include xenografts of human cancers in mouse and host pathogen interac
 
 Installation
 ============
-Xenomapper requires python 3.2 or higher and is tested on linux and MacOS with CPython and pypy3.  For bam file decoding samtools must be installed.
+Xenomapper requires python 3.3 or higher and is tested on linux and MacOS with CPython and pypy3.  For bam file decoding samtools must be installed.
 
 Installing from the Python Package Index with pip is the easiest option:
 

setup.py

@@ -8,7 +8,7 @@
 try:
     import statistics
 except ImportError:
-    install_requires.append('backports.statistics')
+    install_requires.append('statistics')
 
 setup(
     name='XenoMapper',
@@ -33,7 +33,6 @@
           'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
           'Operating System :: POSIX',
           'Programming Language :: Python :: 3 :: Only',
-          'Programming Language :: Python :: 3.2',
           'Programming Language :: Python :: 3.3',
           'Programming Language :: Python :: 3.4',
           'Programming Language :: Python :: Implementation :: CPython',