Changes update for 1.20 release

CHANGES

 = Changes from previous Cobalt Versions =
 
+== Changes to 1.0.20 ==
+ * Fix for certain IO error messages that were ambiguous.
+ * Fix for an issue where attrs on a job are changed as a part of a filter script while
+   using qmove that can cause attrs to become a string instead of a dictionary and
+   disrupt scheduling on a queue.
+
 == Changes to 1.0.19 ==
  * Hotfix for issue preventing rereservations for interactive jobs from being detected.
 
@@ -12,7 +18,7 @@
    jobs and reservations to be used with tools like pdsh
 
 == Changes to 1.0.17 ==
- * Added queue and project information to enviornment in Cray jobs.
+ * Added queue and project information to environment in Cray jobs.
 
 == Changes to 1.0.15 ==
  * Fix for an issue on Cray systems where Cobalt was not properly passing