Upping version for new tagged release

Updating version number for 2.0 beta.

Author: OpenDataAlex

CHANGES.txt

@@ -1 +1,3 @@
-v0.0.1, 2019-05-17 -- Initial beta release.
+v0.1.0, 2019-05-17 -- Initial beta release.
+v0.1.6, 2019-06-01 -- Second beta release. See https://github.com/OpenDataAlex/process_tracker_python/projects/2
+v0.2.0, 2019-06-08 -- Third beta release.  See https://github.com/OpenDataAlex/process_tracker_python/projects/3

dbscripts/mysql_process_tracker_defaults.sql

@@ -19,4 +19,4 @@ INSERT INTO process_tracker.error_type_lkup (error_type_id, error_type_name) VAL
 INSERT INTO process_tracker.process_type_lkup (process_type_id, process_type_name) VALUES (default, 'Extract');
 INSERT INTO process_tracker.process_type_lkup (process_type_id, process_type_name) VALUES (default, 'Load');
 
-INSERT INTO process_tracker.system_lkup (system_id, system_key, system_value) VALUES (default, 'version', '0.1.0');
+INSERT INTO process_tracker.system_lkup (system_id, system_key, system_value) VALUES (default, 'version', '0.2.0');