(#1116) Extends TextEnvelope when possible

See #1131, release log:

• 7ea75c8 by @llorllale: (#1159) Fix release build Remo...
• d7590f7 by @scristalli: (#1143) Using getAbsoluteFile(...
• 042cb34 by @rultor: Merge branch '__rultor'
• afa71cb: (#985) Enabling maven-verifica...
• ca8f39a by @aivinog1: (#985) Fix TODO Format. Trying...
• a385e43 by @aivinog1: (#985) Fix TODO Format
• 1c6f455 by @aivinog1: (#985) Because dates already b...
• a1de4e6 by @llorllale: (#1148) Fix broken build A cou...
• 3410ff4 by @yegor256: hoc
• b3b8600 by @yegor256: project architect
• 09977af by @llorllale: (#1142) Upgrade go-gitlint to ...
• e787511 by @llorllale: (#1142) Switch to go-gitlint
• 94f70b4 by @victornoel: (#1117) Remove some more stati...
• bf47e28 by @scristalli: (#1102) Bugfix: use of object ...
• ebe3034 by @scristalli: (#1102) Refactoring test to us...
• 11cec7d by @scristalli: (#1102) test for toString() me...
• 7e005e4 by @scristalli: (#1102) toString() implementat...
• fe264a4 by @victornoel: (#1086) Remove UncheckedScalar...
• a526feb by @yegor256: xcop and est fixed version in ...
• d5a52c0 by @yegor256: pdd fixed version in Travis
• and 28 more...

Released by Rultor 1.68.4, see build log