Noissue - add 7z requirement into README.md

Since we document how to obtain prebuilt V8 binaries for *nix we should mention also tools required for that.

Additionally it can help to find out all missing requirements in the derived projects.

[sergei, 2018-07-09 14:11:17]

https://codereview.adblockplus.org/29825642/diff/29825647/README.md
File README.md (right):

https://codereview.adblockplus.org/29825642/diff/29825647/README.md#newcode32
README.md:32: one can use `p7zip-full` package and `p7zip` on rpm based.
@Hubert, could you please confirm that it's correct for rpm-based distros?

[hub, 2018-07-09 14:44:39]

https://codereview.adblockplus.org/29825642/diff/29825647/README.md
File README.md (right):

https://codereview.adblockplus.org/29825642/diff/29825647/README.md#newcode32
README.md:32: one can use `p7zip-full` package and `p7zip` on rpm based.
On 2018/07/09 14:11:16, sergei wrote:
> @Hubert, could you please confirm that it's correct for rpm-based distros?

On Fedora 28, `7z` is in `p7zip-plugins`. `p7zip` only contains `7za`.

[sergei, 2018-07-09 15:20:32]

https://codereview.adblockplus.org/29825642/diff/29825647/README.md
File README.md (right):

https://codereview.adblockplus.org/29825642/diff/29825647/README.md#newcode32
README.md:32: one can use `p7zip-full` package and `p7zip` on rpm based.
On 2018/07/09 14:44:39, hub wrote:
> On 2018/07/09 14:11:16, sergei wrote:
> > @Hubert, could you please confirm that it's correct for rpm-based distros?
> 
> On Fedora 28, `7z` is in `p7zip-plugins`. `p7zip` only contains `7za`.

Acknowledged.

[hub, 2018-07-13 14:39:36]

https://codereview.adblockplus.org/29825642/diff/29825659/README.md
File README.md (right):

https://codereview.adblockplus.org/29825642/diff/29825659/README.md#newcode32
README.md:32: one can use `p7zip-full` package and `p7zip-plugins` on rpm-based.
I'd write 

"one can use `p7zip-full` package, or `p7zip-plugins` on rpm-based"

BTW I'm unsure about "RPM based" since I don't know what SuSE does use for their
package name. It possibly differ from Fedora based (or RHEL)

[hub, 2018-07-13 16:11:28]

otherwise LGTM.

[hub, 2018-08-16 18:18:15]

this one should be checked in

[sergei, 2018-08-20 10:07:34]

Since I made a change, I have moved it to gitlab,
https://gitlab.com/eyeo/adblockplus/libadblockplus/merge_requests/12. Let's
continue there.

https://codereview.adblockplus.org/29825642/diff/29825659/README.md
File README.md (right):

https://codereview.adblockplus.org/29825642/diff/29825659/README.md#newcode32
README.md:32: one can use `p7zip-full` package and `p7zip-plugins` on rpm-based.
On 2018/07/13 14:39:36, hub wrote:
> I'd write 
> 
> "one can use `p7zip-full` package, or `p7zip-plugins` on rpm-based"
> 
> BTW I'm unsure about "RPM based" since I don't know what SuSE does use for
their
> package name. It possibly differ from Fedora based (or RHEL)

Done.