Drop python 2.7 and 3.4 Support and testing.

.travis.yml

@@ -1,18 +1,12 @@
 language: python
 python:
-  - "2.7"
-  - "3.4"
   - "3.5"
   - "3.6"
 
 before_install:
   # http://conda.pydata.org/docs/travis.html
   - travis_retry sudo apt-get update
-  - if [[ "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then
-      travis_retry wget https://repo.continuum.io/miniconda/Miniconda2-latest-Linux-x86_64.sh -O miniconda.sh;
-    else
-      travis_retry wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh;
-    fi
+  - travis_retry wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh
   - bash miniconda.sh -b -p $HOME/miniconda
   - export PATH="$HOME/miniconda/bin:$PATH"
   - hash -r

CHANGELOG.md

@@ -3,12 +3,14 @@
 
 Upcoming release:
 
-Simplified oveload operator function.
+Simplified overload operator function.
 
-Handle all warnings as errorsin testing.
+Handle all warnings as errors in testing.
 
 Fix test parameters to avoid invalid values. 
 
+Drop support for python 2.7 due xaxis and flux keywords required with "*,".
+Drop testing of python 3.4 also while at it.
 
 
 0.2.1 14/01/2018

README.md

@@ -63,6 +63,9 @@ I would really appreciate user feedback or suggested improvements if you have an
 Feel free to submit issues or create pull requests.
 
 
+## Python 2.7
+Python 2.7 is only supported in versions <0.2.1 (also available on pip) to make use of useful python3 features.
+
 
 ## Other Spectrum Classes
 

setup.py

@@ -62,9 +62,7 @@
         'Topic :: Scientific/Engineering :: Astronomy',
         'Topic :: Scientific/Engineering :: Physics',
         'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Natural Language :: English',