Update README.md (#46)

* Update README.md

* remove dask < 2 from upstream ci env

* I removed the wrong dependency.

* This should be the right one

README.md

@@ -11,3 +11,18 @@ This package contains a variety of utility functions I have used in the past few
 Please be aware that I am currently refactoring a lot of the code, which might cause breaking changes.
 
 Hopefully soon it will be better tested and documented.
+
+## Installation
+
+To install from source use pip:
+
+`pip install git+https://github.com/jbusecke/xarrayutils.git`
+
+
+## Contents (not complete yet)
+
+### Converting between vertical coordinate systems
+
+`xarrayutils.vertical_coordinates` provides several tool to move between various vertical ocean grids, e.g. z, density, sigma or hybrid coordinates. See [this notebook](https://github.com/jbusecke/xarrayutils/blob/master/doc/vertical_coords.ipynb) for an early example.
+
+

ci/environment-py37-upstream_master.yml

@@ -3,8 +3,7 @@ channels:
  - conda-forge
 dependencies:
  - python=3.7
- - dask < 2 #remove this once upstream problem
- # (https://github.com/pydata/xarray/issues/3574) is fixed
+ - dask
  - numpy
  - pytest
  - future

ci/environment-py37.yml

@@ -4,8 +4,7 @@ channels:
 dependencies:
  - python=3.7
  - xarray < 0.14
- - dask < 2 #remove this once upstream problem
- # (https://github.com/pydata/xarray/issues/3574) is fixed
+ - dask < 2 
  - numpy
  - pytest
  - future