+* `CAL`: colors for calendar's output:
+ * `days`: color for days in current month
+ * `today`: color for today.
+
+### Theme usage
+While entered Rainbow Stream:
+* `theme` and hit ENTER to see which is available.
+* `theme` + TAB twice will show themes list instantly.
+* `theme monokai` will apply `monokai` theme immediately. You can use TAB key for theme's name autocompletion.