Update fish to newest version to fix "grep: warning: GREP_OPTIONS is deprecated"

[Thibaut Brandscheid]

Fish version: 2.1.2
Grep version: 2.21-2

Using grep with fish shell results in Wily Werewolf to the following warning message:
"grep: warning: GREP_OPTIONS is deprecated; please use an alias or script"

The issue has already been fixed upstream:
https://github.com/fish-shell/fish-shell/issues/1832

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: fish 2.1.2+dfsg1-2
ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
Uname: Linux 3.19.0-22-generic x86_64
ApportVersion: 2.17.3-0ubuntu4
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Jul 6 10:05:59 2015
InstallationDate: Installed on 2014-12-17 (200 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: fish
UpgradeStatus: Upgraded to wily on 2015-05-10 (56 days ago)