Updated HISTORY.rst and version info.

HISTORY.rst

@@ -2,6 +2,13 @@
 History
 =======
 
+0.20.0 (2021-11-23)
+-------------------
+
+* Tests are now called via pytest instead of nosetest. This improves stability and test output and adds nice reports.
+* Coverage now works in multiprocessing after properly closing and joining multiprocessing.Pool and adding .coveragerc.
+
+
 0.19.1 (2021-11-19)
 -------------------
 

py_tools_ds/version.py

@@ -22,5 +22,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = '0.19.1'
-__versionalias__ = '20211119_01'
+__version__ = '0.20.0'
+__versionalias__ = '20211123_01'