add __version__ attribute to get installed knesset-data version from code

Author: OriHoch

.travis/after_success.sh

@@ -7,6 +7,7 @@ set -e  # exit on errors
 if [ "${TRAVIS_TAG}" != "" ] && [ "${TRAVIS_REPO_SLUG}" == "hasadna/knesset-data-python" ] && [ "${TRAVIS_PYPI_USER}" != "" ] && [ "${TRAVIS_PYPI_PASS}" != "" ]; then
     echo "publishing tagged release to pypi"
     echo "${TRAVIS_TAG}" > VERSION.txt
+    echo "__version__ = '${TRAVIS_TAG}'" >> knesset_data/__init__.py
     rm -rf dist build
     pip install twine
     ./setup.py bdist_wheel

knesset_data/__init__.py

@@ -1,4 +1,6 @@
 """Knesset Data API
 
 Provides classes that allow fetching data about the Knesset.
-"""
+"""
+
+