0.9.6

• Correctly order calendar properties before calendar components (#98)
• Correctly serialize timestamp values (i.e. REV) (#99)
• Pass correct formatting string to logger (#102) - thanks @CruzR!
• RRULE: Fix floating UNTIL with dateutil > 2.6.1 (#115) - thanks @Unrud!
• Encode params if necessary in serialization (#109) - thanks @matthias-k!
• Ignore escaped semi-colons in UNTIL value (#114) - thanks @Unrud!
• RRULE: Fix VTODO without DTSTART (#116) - thanks @Unrud!
• Fixed regexp for VCF Version 2.1 (#121) - thanks @farmovit!
• repr changed for datetime.timedelta in python 3.7 (#122) - thanks @sharkcz!