`eslint-plugin-prettier` should be a dev dependency

[simonhaenisch]

➤ YN0002: │ @jupiterone/jupiterone-client-nodejs@npm:0.29.0 doesn't provide @types/bunyan (p22fe0), requested by bunyan-category
➤ YN0002: │ @jupiterone/jupiterone-client-nodejs@npm:0.29.0 doesn't provide eslint (pd7fa4), requested by eslint-config-prettier

Getting these two errors when installing which indicate that:

• eslint-plugin-prettier should be in devDependencies
• @types/bunyan could be in dependencies (not sure it's needed though, happy to ignore this warning 🙃)