Use just utilities instead of lodash

[ksheedlo]

This change reduces the Javascript footprint of react-masonry-component
by switching to https://github.com/angus-c/just

[afram]

hi @ksheedlo

Thanks for this PR, just wondering how do you use this library i your project?

We migrated over to the lodash library because most people these days if using React are using Webpack/Rollup with tree pruning so you wouldn't get all of the extra unused methods.

Have you had any particular issues?

[ksheedlo]

We are using browserify, but just should be lighter regardless of what bundler you are using.

Here's a table of imported package weights sourced from bundlephobia.com

Package	Minified + gzipped size
just-merge	261 B
just-debounce-it	207 B
just-omit	208 B
lodash.omit	2.5 KB

Just lodash.omit by itself is 4X larger than all 3 just utilities put together.

[kuznetsov-from-wonderland]

Waiting for this PR being accepted. We have lodash as peer dep in our projects.