Update readme with valid URL examples for iCal

Author: Jared Turner

README.md

@@ -50,14 +50,14 @@ Or install it yourself as:
 
 # ical provides a data-uri which will download a properly formatted *.ics file (see 'Creating HTML links' section)
 @cal.ical_url
-#=> "data:text/calendar;charset=utf8,BEGIN:VCALENDAR%0AVERSION:2.0%0ABEGIN:VEVENT%0ADTSTART=20201212T133000Z%0ADTEND=20201212T143000Z%0ASUMMARY=Christmas%20party%21%0AUID=-20201212T133000Z-Christmas%20party%21%0AEND:VEVENT%0AEND:VCALENDAR"
+#=> "data:text/calendar;charset=utf8,BEGIN:VCALENDAR%0AVERSION:2.0%0ABEGIN:VEVENT%0ADTSTART:20201212T133000Z%0ADTEND:20201212T143000Z%0ASUMMARY:Christmas%20party%21%0AUID:-20201212T133000Z-Christmas%20party%21%0AEND:VEVENT%0AEND:VCALENDAR"
 
 # apple_url and outlook_url are simply helper methods that call ical_url
 @cal.apple_url
-#=> "data:text/calendar;charset=utf8,BEGIN:VCALENDAR%0AVERSION:2.0%0ABEGIN:VEVENT%0ADTSTART=20201212T133000Z%0ADTEND=20201212T143000Z%0ASUMMARY=Christmas%20party%21%0AUID=-20201212T133000Z-Christmas%20party%21%0AEND:VEVENT%0AEND:VCALENDAR"
+#=> "data:text/calendar;charset=utf8,BEGIN:VCALENDAR%0AVERSION:2.0%0ABEGIN:VEVENT%0ADTSTART:20201212T133000Z%0ADTEND:20201212T143000Z%0ASUMMARY:Christmas%20party%21%0AUID:-20201212T133000Z-Christmas%20party%21%0AEND:VEVENT%0AEND:VCALENDAR"
 
 @cal.outlook_url
-#=> "data:text/calendar;charset=utf8,BEGIN:VCALENDAR%0AVERSION:2.0%0ABEGIN:VEVENT%0ADTSTART=20201212T133000Z%0ADTEND=20201212T143000Z%0ASUMMARY=Christmas%20party%21%0AUID=-20201212T133000Z-Christmas%20party%21%0AEND:VEVENT%0AEND:VCALENDAR"
+#=> "data:text/calendar;charset=utf8,BEGIN:VCALENDAR%0AVERSION:2.0%0ABEGIN:VEVENT%0ADTSTART:20201212T133000Z%0ADTEND:20201212T143000Z%0ASUMMARY:Christmas%20party%21%0AUID:-20201212T133000Z-Christmas%20party%21%0AEND:VEVENT%0AEND:VCALENDAR"
 ```
 
 ### Creating HTML links