The UglifyJS step has been failing on Travis, and I finally got time to poke at it. It seems that NPM has decided to change its default version to an incompatible one (wrt. command-line arguments, at least), which breaks the build. In deference to the primary build machines being Fedora-25 and Fedora-26, both of which are still working, this PR is trying to force Travis to run compatibly.
The UglifyJS step has been failing on Travis, and I finally got time to poke at it. It seems that NPM has decided to change its default version to an incompatible one (wrt. command-line arguments, at least), which breaks the build. In deference to the primary build machines being Fedora-25 and Fedora-26, both of which are still working, this PR is trying to force Travis to run compatibly.