Updated rollup to solve installation error

Checklist

• PR contains only changes related; no stray files, etc.
• [] README updated (where applicable)
• [] Tests written (where applicable)

rollup latest version doesnot seem to support older versions. Also node 6.0 is way old i think we should drop tests for it as its likely someone is using that

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Even if node 6 may not be used anymore this is a breaking change and should be released in a new major.

however its a blocker if you cant install the package dependencies after forking. @profnandaa

tested on node v10,12 and v14.

Don't leave out Node 6 yet, there's a time it helped us catch an old browser incompatibility, see #1357

@profnandaa fixed it without breaking support for node 6

@profnandaa should i also make a pr to update eslint and some tools. They are way old