Drop support for EOL Python

Author: hugovk

.travis.yml

@@ -1,8 +1,6 @@
 language: python
 python:
-  - "2.6"
   - "2.7"
-  - "3.3"
   - "3.4"
   - "3.5"
   - "3.6"

gitdb/util.py

@@ -19,10 +19,7 @@
 
 # initialize our global memory manager instance
 # Use it to free cached (and unused) resources.
-if sys.version_info < (2, 6):
-    mman = StaticWindowMapManager()
-else:
-    mman = SlidingWindowMapManager()
+mman = SlidingWindowMapManager()
 # END handle mman
 
 import hashlib

setup.py

@@ -22,6 +22,7 @@
     zip_safe=False,
     install_requires=['smmap2 >= 2.0.0'],
     long_description="""GitDB is a pure-Python git object database""",
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
     # See https://pypi.python.org/pypi?%3Aaction=list_classifiers
     classifiers=[
         "Development Status :: 5 - Production/Stable",
@@ -34,11 +35,8 @@
         "Operating System :: MacOS :: MacOS X",
         "Programming Language :: Python",
         "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.6",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.2",
-        "Programming Language :: Python :: 3.3",
         "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
     ]