drop python 3.4 support

Author: Joseph Hamman

.travis.yml

@@ -14,8 +14,6 @@ matrix:
     env: CONDA_ENV=py27-min
   - python: 2.7
     env: CONDA_ENV=py27-cdat+iris+pynio
-  - python: 3.4
-    env: CONDA_ENV=py34
   - python: 3.5
     env: CONDA_ENV=py35
   - python: 3.6

doc/installing.rst

@@ -6,7 +6,7 @@ Installation
 Required dependencies
 ---------------------
 
-- Python 2.7, 3.4, 3.5, or 3.6
+- Python 2.7, 3.5, or 3.6
 - `numpy <http://www.numpy.org/>`__ (1.11 or later)
 - `pandas <http://pandas.pydata.org/>`__ (0.18.0 or later)
 

doc/whats-new.rst

@@ -13,6 +13,18 @@ What's New
     import xarray as xr
     np.random.seed(123456)
 
+.. _whats-new.0.11.0:
+
+v0.11.0 (unreleased)
+--------------------
+
+Breaking changes
+~~~~~~~~~~~~~~~~
+
+- Changes to minimum versions of dependencies:
+  - Xarray no longer support Python 3.4 (:issue: `1829`).
+    By `Joe Hamman <https://github.com/jhamman>`_.
+
 .. _whats-new.0.10.1:
 
 v0.10.1 (unreleased)