minor word after colon must be capitalized

See #31, release log:

• 93b6175 by @yegor256: #31 pre off
• 687ea73 by @yegor256: #31 show position correctly
• 17173b1 by @yegor256: #31 stronger test
• ab871af by @yegor256: #31 exit code is 1 if bibcop.p...
• cb33468 by @yegor256: #31 capitalization improved
• f528f25 by @yegor256: #30 better check authors

Released by Rultor 1.75.0, see build log