Fix CI release step

See AppImageCommunity/AppImageUpdate@f2a6873

Remove graphic which mentioned freenode

[ci skip]

Merge pull request #1103 from omegacoleman/fix-appstream-crash

fix #856: block envs set in resources/AppRun when invoking appstream utilities

Merge pull request #953 from AppImage/extract-and-run-env-var

Allow using extract-and-run via environment variable

Update .travis.yml

Cosmetic fix for message

feature/usage

Merge pull request #359 from orivej/build-debug

Support debug build

Merge pull request #354 from darealshinji/patch-1

avoid unneeded if-statements, initializer fixes

Decrease verbosity, no false alarms