WIP: add cvxgrp channel to appveyor.yml config

[jwdinius]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 799

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 42 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.5%) to 90.073%

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Files with Coverage Reduction	New Missed Lines	%
PathPlanning/ReedsSheppPath/reeds_shepp_path_planning.py	2	90.41%
PathPlanning/LQRRRTStar/lqr_rrt_star.py	2	76.63%
PathPlanning/ClosedLoopRRTStar/pure_pursuit.py	4	92.97%
PathPlanning/ClosedLoopRRTStar/closed_loop_rrt_star_car.py	34	67.32%

Totals
Change from base Build 797:	-0.5%
Covered Lines:	6787
Relevant Lines:	7535

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💛 - Coveralls