Simplify pip install instructions

Signed-off-by: John Pennycook <john.pennycook@intel.com>

Author: Pennycook

README.md

@@ -49,9 +49,7 @@ The latest release of CBI is version 2.0.0. To download and install this
 release, run the following:
 
 ```
-git clone --branch 2.0.0 https://github.com/intel/code-base-investigator.git
-cd code-base-investigator
-pip install .
+pip install git+https://github.com/intel/code-base-investigator@2.0.0
 ```
 
 We strongly recommend installing CBI within a [virtual

docs/source/index.rst

@@ -62,9 +62,7 @@ Installation
 The latest release of CBI is version 2.0.0. To download and install this
 release, run the following::
 
-    $ git clone --branch 2.0.0 https://github.com/intel/code-base-investigator.git
-    $ cd code-base-investigator
-    $ pip install .
+    $ pip install git+https://github.com/intel/code-base-investigator@2.0.0
 
 We strongly recommend installing CBI within a virtual environment, to simplify
 dependency management and improve security. Some alternative methods of