Revert "Removed all usages of Eric IDE, because apparently it's not using Jedi anymore"

This reverts commit e47bbbb851.

README.rst

@@ -42,6 +42,7 @@ Jedi can currently be used with the following editors/projects:
 - `GNOME Builder`_ (with support for GObject Introspection)
 - Gedit (gedi_)
 - wdb_ - Web Debugger
+- `Eric IDE`_ (Available as a plugin)
 - `IPython 6.0.0+ <https://ipython.readthedocs.io/en/stable/whatsnew/version6.html>`_
 - `xonsh shell <https://xon.sh/contents.html>`_ has `jedi extension <https://xon.sh/xontribs.html#jedi>`_
 
@@ -212,3 +213,4 @@ Thanks a lot to all the
 .. _GNOME Builder: https://wiki.gnome.org/Apps/Builder
 .. _Visual Studio Code: https://code.visualstudio.com/
 .. _gedi: https://github.com/isamert/gedi
+.. _Eric IDE: https://eric-ide.python-projects.org

docs/docs/usage.rst

@@ -83,6 +83,11 @@ Gedit
 
 - gedi_
 
+Eric IDE
+~~~~~~~~
+
+- `Eric IDE`_ (Available as a plugin)
+
 Web Debugger
 ~~~~~~~~~~~~