fix(nx): use same prettier version

[mehrad-rafigh]

Current Behavior (This is the behavior we have today, before the PR is merged)

prettier is installed in two different version. (1.16.4 and 1.18.2)

Expected Behavior (This is the new behavior we can expect after the PR is merged)

prettier is installed with the same version (1.18.2)

Issue

Closes #1863

[catfireparty]

Am I right in thinking this simply updates the internal version of prettier rather than does anything clever like checking for a more up to date locally installed version?

There's a lot of formatting noise in this PR unfortunately :(

(Do we have an agreed line length? A lot of these changes seem to be consolidating multiple lines onto a single line...)

[mehrad-rafigh]

Hi @jdpearce. Thank you for your review. Yes you are right. I am not doing any clever checking, because the last PR actually should have done this. See here
This PR just updates the prettier version of nrwl to reflect the same version used here

But you are right, this PR collapses multiple lines into a single one.
As for the line length, there is no limitation in the .prettierrc, thus falling back to prettier's standard line length of 80 characters.

[catfireparty]

I'm going to merge this - if we need to do anything cleverer we can raise another issue :)

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