🥳 Update ign-tools issue on README (#184)

Signed-off-by: Louise Poubel <[email protected]>

README.md

@@ -26,27 +26,12 @@ See the [installation tutorial](https://ignitionrobotics.org/api/msgs/6.2/index.
 In the event that the installation is a mix of Debian and from source, command
 line tools from `ign-tools` may not work correctly.
 
-A workaround for a single package is to define the environment variable
+A workaround is to define the environment variable
 `IGN_CONFIG_PATH` to point to the location of the Ignition library installation,
 where the YAML file for the package is found, such as
 ```
 export IGN_CONFIG_PATH=/usr/local/share/ignition
 ```
 
-However, that environment variable only takes a single path, which means if the
-installations from source are in different locations, only one can be specified.
-
-Another workaround for working with multiple Ignition libraries on the command
-line is using symbolic links to each library's YAML file.
-```
-mkdir ~/.ignition/tools/configs -p
-cd ~/.ignition/tools/configs/
-ln -s /usr/local/share/ignition/fuel4.yaml .
-ln -s /usr/local/share/ignition/transport8.yaml .
-ln -s /usr/local/share/ignition/transportlog8.yaml .
-...
-export IGN_CONFIG_PATH=$HOME/.ignition/tools/configs
-```
-
-This issue is tracked [here](https:/ignitionrobotics/ign-tools/issues/8).
+This issue is tracked [here](https:/ignitionrobotics/ign-tools/issues/61).