Update README with correct pip install url and up usage instructions

README.md

 # lvcnrpy
 
-`lvcnrpy` is a simple Python interface to the LVC-NR Waveform Repository.
+`lvcnrpy` is a simple Python interface to the
+[`lvcnr-lfs`](https://git.ligo.org/waveforms/lvcnr-lfs) numerical relativity
+repository.
 
 ## Installation
 
 1.  **Install the package locally**
 
     The package can be installed directly from
-    [git.ligo.org](https://git.ligo.org/) using the following snippet. Use your
-    LIGO username `albert.einstein` and password when asked for
-    authorisation
+    [`git.ligo.org`](https://git.ligo.org/) using the following snippet
 
     ```bash
-    $ pip install git+https://git.ligo.org/edward.fauchon-jones/lvcnrpy.git@v3.0.0#egg=lvcnrpy
+    $ pip install git+https://git.ligo.org/waveforms/lvcnrpy.git
     ```
 
-2.  **Define LVC-NR Waveform Repository environment variable**
+2.  **Define [`lvcnr-lfs`](https://git.ligo.org/waveforms/lvcnr-lfs) repository environment variable**
 
-    Define the environment variable `LVCNR_DATADIR` as the path to your local
-    clone of the LVC-NR Waveform Repository. If you are using a virtual
-    environment this can be defined in your activation script. For a bash shell
-    this could be done with
+    To use [`lvcnrjson`](#generating-a-json-dump-of-all-lvcnr-lfs-attributes)
+    you must define the environment variable `LVCNR_DATADIR` as the path to
+    a local clone of the
+    [`lvcnr-lfs`](https://git.ligo.org/waveforms/lvcnr-lfs) repository. If you
+    are using a virtual environment this can be defined in your activation
+    script. For a bash shell this could be done with
 
     ```bash
     export LVCNR_DATADIR=<path-to-lvc-nr-repo>
     ```
+    
+    If you do not want to use `lvcnrjson` then you can set the environment
+    variable to an empty sting. For a bash shell this could be done with
+    
+    ```bash
+    export LVCNR_DATADIR=""
+    ```
 
 ## Usage
 
 ### Checking HDF5 NR files against format specifications
 
-A working draft of the possible formats HDF5 NR files may be committed in to the
-LVC-NR Waveform Repository is avilable at
+A working draft of the possible formats HDF5 NR files may be committed in to
+the [`lvcnr-lfs`](https://git.ligo.org/waveforms/lvcnr-lfs) repository is
+avilable at
 [Numerical Relativity Waveforms](https://www.lsc-group.phys.uwm.edu/ligovirgo/cbcnote/Waveforms/NR#BBH_Waveform_Catalog:_Metadata).
 To check a HDF5 NR file against one of the format levels use the included
 program `lvcnrcheck`. It is installed as a global program when this package is
@@ -72,9 +82,27 @@ installed.
 
     To add a coloured output use the `-c` flag
 
-    To check against a specific format level use the `-f` option
-
     ```bash
     $ cd <path-to-lvc-nr-repo>
     $ lvcnrcheck -c ./Cardiff-UIB/GW150914-followup/q1.2_base_96.h5
     ```
+    
+### Generating a JSON dump of all [`lvcnr-lfs`](https://git.ligo.org/waveforms/lvcnr-lfs) attributes
+
+To generate a JSON file containing all format level 1 attributes for all
+simulations in the [`lvcnr-lfs`](https://git.ligo.org/waveforms/lvcnr-lfs)
+repository you can use `lvcnrjson`. This requires that the environment
+variable `LVCNR_DATADIR` has been set to the location of a local clone of
+[`lvcnr-lfs`](https://git.ligo.org/waveforms/lvcnr-lfs) repository.
+
+-   **`lvcnrjson` usage**
+    
+    ```bash
+    lvcnrjson [-h]
+
+    Export format level 1 metadata for all simulations to JSON
+
+    optional arguments:
+      -h, --help  show this help message and exit
+    ```
+