Fixed version check for pgRouting v3 support

[cayetanobv]

Fixes #126 .

Changes proposed in this pull request:

• fixed pgr_version check for v3
• updated docs

@pgRouting/admins

[agiudiceandrea]

Hi @cayetanobv, did you forget to merge these commits?

[cayetanobv]

Thanks @agiudiceandrea
Yes, I forgot to merge because v3 was released after this change.

[cayetanobv]

@dkastl @cvvergara I think we can merge this PR. Culd you approve PR?

[agiudiceandrea]

Hi @cayetanobv,

in https://github.com/pgRouting/pgRoutingLayer/blob/master/README.md is stated that:

Dependencies
pgRouting v2.x up and running to use this plugin.

So, this should be changed to pgRouting v3.x, isn't it?

It is also stated that:

Additionally, QGIS needs python-psycopg2 installed to be able to connect to the database.

Is python-psycopg2 yet needed? Or is python3-psycopg2 needed instead?

[cayetanobv]

yes, you are right @agiudiceandrea . Docs should be fixed. Could you update this versions and push it with this PR so we can merge all together?

[cayetanobv]

Thanks @agiudiceandrea

[cayetanobv]

Sorry @agiudiceandrea but I didn't notice that you are pushing to my branch and you haven't permissions so your code wasn't merged. Could you open a new branch with these changes and open a new PR? After that, I can merge your changes.
Thanks again.