Log Message:
hub: Update to 2.10.0

Changes:
2.10.0
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Features
 - New hub pr list --format fields %pS and %pC for PR state and color
    o %pS: "open", "draft", "merged", or \ 
"closed"
    o %pC: green, gray, purple, or red
 - Have commands with rich output respect the --color flag
    o default: --color=auto
    o --color is equivalent to --color=always
    o --color=never disables color for TTYs

Fixes
 - Make man pages parseable with whatis
 - Make hub checkout work independently of remote refspec