update install instructions

Author: thecharlieblake

README.md

@@ -19,7 +19,12 @@ We're keen to help users with any problems they encounter.
 To install the `unit-scaling` library, run:
 
 ```sh
-pip install git+https://github.com/graphcore-research/unit-scaling.git
+pip install unit-scaling
+```
+or for a local editable install (i.e. one which uses the files in this repo), run:
+
+```sh
+pip install -e .
 ```
 
 ## Development

docs/index.rst

@@ -18,7 +18,7 @@ To install :code:`unit-scaling`, run:
 
 .. code-block::
 
-    pip install git+https://github.com/graphcore-research/unit-scaling.git
+    pip install unit-scaling
 
 Getting Started
 ---------------

docs/user_guide.rst

@@ -19,7 +19,7 @@ To install the :code:`unit-scaling` library, run:
 
 .. code-block::
 
-    pip install git+https://github.com/graphcore-research/unit-scaling.git
+    pip install unit-scaling
 
 For those who wish to develop on the :code:`unit-scaling` codebase, clone or fork our
 `GitHub repo <https://github.com/graphcore-research/unit-scaling.git>`_ and follow the