Release 2.1.0

These release notes were written for the git hash ae84df4cef4a2a6f1a0cb1d41ea0f3af8755e5a8

Fixed

• Fixed some golint errors in #988 via @liamchampton
• Fixed a panic with flag completion #946 via @unRob

Changed

• Changed docs generation to use visible flags in #999 via @subpop
• Changed App.Run to use an optional context for timeouts and cancellation in #975 via @marwan-at-work
• Changed version info to be hidden if the user has not defined a version in #955 via @asahasrabuddhe
• Changed docs generation to take into account multiple authors in #900 via @saschagrunert
• Changed context to expose a Value accessor in #741 via @corruptmemory

Added

• Added timestamp flag in #987 via @drov0