Drop Python 2.7 support (fix #833)

.travis.yml

@@ -14,9 +14,6 @@ addons:
 #  - "$HOME/install/"
 
 env:
-  - PYTHON_VERSION=2.7
-  #- PYTHON_VERSION=3.3
-  #- PYTHON_VERSION=3.4
   - PYTHON_VERSION=3.5
   - PYTHON_VERSION=3.6
   - PYTHON_VERSION=3.7

README.md

@@ -76,7 +76,7 @@ If that is the case, it is best to clean the repo and reinstall.
 [<img src="https://upload.wikimedia.org/wikipedia/commons/8/8e/OS_X-Logo.svg" height=40px>](http://www.apple.com/osx/)
 [<img src="https://upload.wikimedia.org/wikipedia/commons/3/35/Tux.svg" height=40px>](https://en.wikipedia.org/wiki/List_of_Linux_distributions)
 
-Python 2.7, 3.5 and higher
+Python 3.5 and higher
 
 ## Citation
 

appveyor.yml

@@ -5,8 +5,6 @@ environment:
     secure: d3Luic/ESkGaWnZrvWZTKrzO+xaVwJWaRCEP0F+K/9DQGPSRZsJ/Du5g3s4XF+tS
   gpy_version: 1.9.9
   matrix:
-    - PYTHON_VERSION: 2.7
-      MINICONDA: C:\Miniconda-x64
     - PYTHON_VERSION: 3.5
       MINICONDA: C:\Miniconda35-x64
     - PYTHON_VERSION: 3.6

setup.py

@@ -182,9 +182,9 @@ setup(name = 'GPy',
                    'Operating System :: MacOS :: MacOS X',
                    'Operating System :: Microsoft :: Windows',
                    'Operating System :: POSIX :: Linux',
-                   'Programming Language :: Python :: 2.7',
                    'Programming Language :: Python :: 3.5',
                    'Programming Language :: Python :: 3.6',
+                   'Programming Language :: Python :: 3.7',
                    'Framework :: IPython',
                    'Intended Audience :: Science/Research',
                    'Intended Audience :: Developers',