Just inform about "manifest_version": 2 warning

[neuroLena]

'Manifest version 2 is deprecated, and support will be removed in 2023. See https://developer.chrome.com/blog/mv2-transition/ for more details.
{
"manifest_version": 2,
"name": "arxiv - shortscience integration",
"version": "0.1",
"permissions": [
"http://www.shortscience.org/"
],
"content_scripts": [
{
"matches": [
"http://arxiv.org/abs/",
"https://arxiv.org/abs/*"
],
"js": [
"jquery-2.2.3.min.js",
"content.js"
]
}
]
}
'