Versioning v1.1.1 to correctly comply with SemVer.

CHANGELOG 03b6f63 Add AUTHORS file; update LICENSE (#158) 9ee0d62 [build] Update deps to correct SemVer tags (#153) a2f2a3d replacing travis badge with scaling svg (#147) 92b749d Add link to XORM store implementation (#149) 7910f5b Added description about Max-Age field in Options (#148) 7087b4d Add go.mod file for vgo dependency management. (#145) 6ba88b7 Prevent panic in NewSession function (#140) 41ee504 Add link to memstore implementation (#143) fe21b6a Update doc.go (#127) a3acf13 Add missing error check (#123)