update dev dependencies

[borracciaBlu]

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[borracciaBlu]

on npm audit:

found 9 vulnerabilities (2 low, 2 moderate, 4 high, 1 critical)

these apparently are related to marshmallow and inject-ga.

I see that these two package are not strictly related to the package and are used only on deploy:

"deploy": "marshmallow -o docs -i artwork.psd -f -m && inject-ga docs/index.html -o docs/index.html -c 'UA-24389952-13' && boeing docs && rimraf docs",

If i may, i would suggest to remove the two packages and in deploy use instead npx:

"deploy": "npx marshmallow -o docs -i artwork.psd -f -m && npx inject-ga docs/index.html -o docs/index.html -c 'UA-24389952-13' && npx boeing docs && rimraf docs",

[borracciaBlu]

In here i got a working prototype
borracciaBlu/banner-cli@aed3ea8

additional benefit of npx you don't have to keep update these packages all the times because npx is going to use the latest version