Update the version number and add note about PyPI installation (#23)

Author: bouweandela

README.md

@@ -14,7 +14,7 @@ The functionality of this repository is kept simple.
 After installing [iris](https://scitools-iris.readthedocs.io/en/latest/installing.html), this package can be installed with the command:
 
 ```bash
-pip install ESMValTool_sample_data@git+https://github.com/ESMValGroup/ESMValTool_sample_data
+pip install ESMValTool_sample_data
 ```
 
 Data can be loaded using the following command for daily or monthly timeseries data.

setup.py

@@ -9,7 +9,7 @@
 
 setup(
     name='ESMValTool_sample_data',
-    version='0.0.3',
+    version='0.0.4',
     description="ESMValTool sample data",
     long_description=readme,
     long_description_content_type='text/markdown',