HTTPS url for Maven

See #375, release log:

• 8147c32 by @yegor256: #375 rultor
• ad71740 by @yegor256: #375 https
• 6eb85f8 by @yegor256: Merge pull request #372 from k...
• e239a92 by @paulodamaso: For #373: Updating maven proto...
• 8619f8f by @paulodamaso: For #373: Updating rultor imag...
• 7f3a8f7 by @keddok: fixed maven repo link
• d747224 by @rultor: Merge branch '__rultor'
• 70794d6: #359 implement PMD checks
• 5be543b: #359 implement Qulice checks
• 673dd8d: #359 remove unused imports
• 1209c7d: #359 remove pazzler as an issu...
• b68eb4a: #324 update maven-compiler-plu...
• 8338acd: #359 add new puzzler
• 4b12c54: #359 use new class
• b8bd01a: #359 create ClassAsXml class

Released by Rultor 1.68.9, see build log