Sort environment variable list in faas-cli describe

Changelog for 0.14.8:

• PR #933 Make envVar output from describe deterministic by @rgee0

Commits
35fcca5 Make describe output for envvars deterministic by @rgee0
e390a02 Add multiple env vars to describe test table by @rgee0
d08553e Update examples to remove Swarm format in stack.yml by @alexellis
dff5735 Fix typo in help message for publish command by @alexellis

Changes: 0.14.7...0.14.8

Generated by Derek