Use official semver regex

Resolves #16.

Changes

@@ -15,6 +15,8 @@ Revision history for Perl extension PGXN::API
       - The indexer will now index a testing release if there are no stable
         releases, and will index an unstable release if there are neither stable
         nor testing releases (#2).
+      - Updated the SemVer regex when parsing rsync output to the official
+        version published in https://regex101.com/r/vkijKf/ (#16).
 
 0.16.5  2016-06-22T18:03:05Z
       - Fixed a test failure on systems with a non-English locale, thanks to

lib/PGXN/API/Sync.pm

@@ -112,7 +112,8 @@ sub regex_for_uri_template {
 
     my %regex_for = (
         '{dist}'      => qr{[^/]+?},
-        '{version}'   => qr{(?:0|[1-9][0-9]*)(?:[.][0-9]+){2,}(?:-[a-z][-0-9a-z]*)?},
+        # https://regex101.com/r/vkijKf/
+        '{version}'   => qr{(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?},
         '{user}'      => qr{([a-z]([-a-z0-9]{0,61}[a-z0-9])?)}i,
         '{extension}' => qr{[^/]+?},
         '{tag}'       => qr{[^/]+?},