add LGTM

[chris48s]

Checklist

• I updated the JSON data in _data/simple-icons.json
• I optimized the icon with SVGO or SVGOMG
• The SVG viewbox is 0 0 24 24

Description

This is another difficult one to source well. Usually the LGTM logo has more colours (most clearly seen here https://github.com/lgtmhq/ ). This is based on a version which was adapted by one of the LGTM devs: badges/shields#1679 - it reduces to 1 colour well. There are no formal brand guidelines.

alexa rank: https://www.alexa.com/siteinfo/lgtm.com

[ericcornelissen]

I'm a bit wary of adding LGTM right now, although promising and somewhat popular (i.e. Alexa rank of almost 500k) it seems to be a pretty new project (started in ~October of last year) if I look at the Alexa rank.

Do you have any other sources of the popularity and lifespan of the project?

[birjj]

@ericcornelissen I'm ok with adding it; the deprecated GitHub archive had ~1k stars, a respectable (although not massive) amount, and the Alexa rank has risen significantly in the last two months. Further, 502k is so close to our cut-off that it'd almost feel petty to decline based on that :P

[ericcornelissen]

@birjolaxew my problem is not with regards to popularity but with regards to the lifespan of the project. To be fair though I don't expect the service to be shut down anytime soon, also given there's a bigger company behind lgtm (Semmle).

I'm okay merging this if you are 👍