author name checking is too weak

See #53, release log:

• a0c5573 by @yegor256: #53 checking of authors is str...
• bd0ab03 by @yegor256: #52 fixed
• c942307 by @yegor256: #51 links
• 351477f by @yegor256: #51 links
• d243def by @yegor256: #51 copy first
• 8e273f7 by @yegor256: #51 only for ubuntu
• 0bf8aac by @yegor256: #51 path fixed
• 815d7bd by @yegor256: #51 set version to the .pl fil...
• 5d87edf by @yegor256: #48 extra tests
• 9494995 by @yegor256: ping
• b9f6336 by @yegor256: #44 more tests
• 26080d1 by @yegor256: #44 update
• adeb46e by @yegor256: #44 fixed
• 35279e2 by @yegor256: #47 fixed
• 22e0d3e by @yegor256: more symbols for DOI
• 6b9f535 by @yegor256: explained
• 40e8f47: Add test and patch for #40
• fa0f5f5 by @yegor256: better log
• 69afd25 by @yegor256: extra test
• 72faf5c by @yegor256: #42 show line number
• and 10 more...

Released by Rultor 2.0-SNAPSHOT, see build log