Update highlight install command

[cserteGT3]

I've experienced some issues with the highlight.js package installation, and finally this command solved it:

[sudo] npm install --save -g highlight.js

So --save is needed (in my case at least). I'm not experienced with node.js at all, so it's possible that it's not a perfect solution.
Sources:
stackoverflow, meteor issue.

Edit: I think this caused #174 (at least the node.js part).

[codecov]

Codecov Report

Merging #178 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #178   +/-   ##
=======================================
  Coverage   87.47%   87.47%           
=======================================
  Files          23       23           
  Lines         966      966           
=======================================
  Hits          845      845           
  Misses        121      121

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a402f20...30d449c. Read the comment docs.

[codecov]

Codecov Report

Merging #178 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #178   +/-   ##
=======================================
  Coverage   87.47%   87.47%           
=======================================
  Files          23       23           
  Lines         966      966           
=======================================
  Hits          845      845           
  Misses        121      121

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a402f20...30d449c. Read the comment docs.

[tlienart]

Thanks a lot for this!

[mbaz]

I had the opposite problem:

$ sudo npm install --save -g highlight.js
+ [email protected]
updated 1 package in 0.384s

$ node -e "require('highlight.js')"
internal/modules/cjs/loader.js:670
    throw err;
    ^

Error: Cannot find module 'highlight.js'
[...]

$ sudo npm install -g highlight.js
+ [email protected]
updated 1 package in 0.428s
$ node -e "require('highlight.js')"
$

[cserteGT3]

To be precise, when I tried this (--save) on another Windows machine, I couldn't get it to work for first try. It worked only after running this and the original command couple of times, so I'm not sure that this is the way to do the installation. (On my laptop, this worked for the first time).
Maybe we should roll back to the original command and mention the linked posts? Then everyone can figure out if encounters the error.

(Btw. I'm thinking on switching to linux. I'm starting to hate windows :D )

[tlienart]

Hmm shoot, I also did it like @mbaz and it worked.

I guess in want of a clear explanation, I'll change the doc slightly to say that the former should work, and that the --save may help otherwise e.g. on windows.