install: upgade pre-release isntructions for 1.0

per #1195 (review)

content/docs/install/pre-release.md

@@ -10,16 +10,9 @@ releases, you can install it from our code repository GitHub.
 > (on Python 3.6+) to encapsulate your local environment.
 
 ```dvc
-$ pip install gitpython
-$ pip install git+https://github.com/iterative/dvc
+$ pip install --upgrade --pre dvc
 ```
 
-> `gitpython` allows the installation process to generate a DVC version using
-> the current Git commit hash. This lets us to distinguish official DVC releases
-> (e.g. `0.64.3`) from a development version (e.g. `0.64.3-9c7381`). For more
-> information on our versioning convention, refer to
-> [Components of DVC version](/doc/command-reference/version#components-of-dvc-version).
-
 To install a development version for contributing to the project, please refer
 to
 [Development environment](/doc/user-guide/contributing/core#development-environment).