Update docs and bump version

Author: kchason

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v2.3.0
+    rev: v4.1.0
     hooks:
     -   id: check-json
     -   id: pretty-format-json

README.md

@@ -27,7 +27,7 @@ Mapping notes & respective JSON-LD output:
 - [SMS and Contacts](examples/illustrations/sms_and_contacts/sms_and_contacts.json)
 
 
-This project uses [the `pre-commit` tool](https://pre-commit.com/) for linting the JSON files and ensuring consistent formatting. The easiest way to install it is with `pip`:
+This project uses [the `pre-commit` tool](https://pre-commit.com/) for linting the JSON files and ensuring consistent formatting. It can be installed with `pip`:
 ```bash
 pip install pre-commit
 pre-commit --version
@@ -36,4 +36,6 @@ pre-commit --version
 The `pre-commit` tool hooks into Git's commit machinery to run a set of linters and static analyzers over each change. To install `pre-commit` into Git's hooks, run:
 ```bash
 pre-commit install
-```
+```
+
+To uninstall `pre-commit`, run either `pre-commit uninstall` or `rm .git/hooks/pre-commit`.