support extended alphabet in URLs (#12)

* support extended alphabet in URLs

related to some GBFS URLs added in transitland/transitland-atlas#1367

* update symbolic link

* `patternFlags` not supported in the ajv-cli library used in Transitland Atlas CI

* try again using just regex

* restore some missing notes

* apply consistent formatting to v0.5.0 and v0.5.1

* update changelog for v0.5.1

* return to previous formatting

* return to previous format

* return to previous formatting

Author: drewda

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## v0.5.1
+
+- Feed URLs are now validated more permissively, to allow a wider range of alphabetic characters from non-English languages.
+
 ## v0.5.0
 
 - A feed record can now have an optional `name` and `description` fields to provide additional context to DMFR editors and users of software that consume DMFR files.